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Abstract

Background:

Information on coronavirus disease 2019 (COVID-19) infection in patients with chronic kidney disease (CKD) remains limited. To understand the influence of COVID-19 infection in patients with pre-existing CKD, we conducted a systematic review and meta-analysis to evaluate and compare the risks of all-cause mortality, hospitalization, and critical progression between patients with and without CKD.

Methods:

We selected randomized controlled trials (RCTs), prospective or retrospective observational, case-control, cross-sectional, and case-series studies analyzing outcomes of COVID-19 infection in patients with pre-existing CKD from the PubMed, Embase, and Cochrane Central Register of Controlled Trials databases published on the Internet before 16 July 2020.

Results:

A total of 27 studies comprising 77,856 patients with COVID-19 infection was identified; 3922 patients with pre-existing CKD were assigned CKD group, and 73,934 patients were assigned to the non-CKD group. The pooled analysis showed that patients with CKD had a significantly higher risk of all-cause mortality and hospitalization than those without CKD [odds ratio (OR) 2.25, 95% confidence interval (CI) 1.91–2.66, p < 0.001; OR 4.29, 95% CI 2.93–6.28, p < 0.001; respectively]. Patients with CKD had a higher risk of critically ill conditions than those without CKD in the pooled analysis of studies with multivariable adjustment (adjusted OR 2.12, 95% CI 0.95–4.77, p = 0.07) and in the analysis of all included studies (OR 1.27, 95% CI 0.71–2.26, p = 0.41), but both analyses did not attain statistical significance.

Conclusion:

COVID-19 infected patients with CKD had significantly increased risks of all-cause mortality and hospitalization compared with those without CKD.

Keywords

chronic kidney disease COVID-19 hospitalization meta-analysis mortality

Introduction

A coronavirus 2019 (COVID-19) disease outbreak occurred in Wuhan, Hubei Province, China in December 2019, and has been declared a global pandemic by World Health Organization (WHO).¹ COVID-19 is highly contagious by human-to-human transmission, and can cause critical condition and even death.² There were over 20 million confirmed cases and over 800,000 deaths by the end of August 2020.³ Although underlying diseases have been considered one of the major risk factors of clinical outcomes such as acute respiratory distress syndrome (ARDS), sepsis, shock, and all-cause mortality,^4,5 the relationship between the specific underlying disease, for example, kidney dysfunction, and these outcomes of patients with COVID-19 remains unclear.

The main clinical features of severe COVID-19 infection are lung destruction and respiratory failure, but some studies have shown that COVID-19 infection also involves other organs, including kidney and liver.^6–8 Recent clinical evidence has revealed that COVID-19 patients with acute kidney injury (AKI) had fatal outcomes.^6,9,10 This implies that patients with pre-existing chronic kidney disease (CKD), who have functional defects in their innate and adaptive immune cells, may have a higher risk of COVID-19 infection and death.^11–13 Clinicians should take more notice of medical management and prevention of COVID-19 infection in this population.

Although several investigations have reported CKD in patients with COVID-19 infection, the data collected were usually restricted to a single hospital or country.^14,15 Hence, we conducted a systematic review and meta-analysis to evaluate the influence of pre-existing CKD on risks of all-cause mortality, hospitalization, and critically ill condition among patients with COVID-19 infection.

Materials and methods

This systematic review and meta-analysis was established according to the PRISMA checklist (Supplemental File S1)¹⁶ and was registered with PROSPERO (registration number: CRD42020198797). Randomized controlled trials (RCTs), prospective or retrospective observational, case-control, cross-sectional, and case-series studies analyzing outcomes of COVID-19 infection in patients with pre-existing CKD were included. We excluded studies with patients younger than 18 years of age, receiving transplantation or under maintenance dialysis, animal studies, and those without abstract or full text for further data extraction. Eligible studies were identified after searching the following electronic databases: PubMed, Embase, and the Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library for publications appearing before 16 July 2020 on the internet. We first retrieved studies by specific filters in electronic databases and then used the following keywords to identify eligible studies: “COVID-19” or “coronavirus disease 2019” combined with “Renal” or “Kidney”. We then reviewed the abstracts and obtained the full texts of studies for patients including CKD. The studies retrieved were then reviewed independently by another author. The exact search strategy of PubMed is described in Supplemental File S2. Any differences in opinion between the two assessors (Y.C.L. and T.S.L.) were then discussed with a third author in conference to achieve a consensus.

Data extraction and quality assessment

Two investigators (Y.C.L. and T.S.L.) reviewed the full texts of selected studies, integrated data for the characteristics of studies and patients, and assessed the quality of individual included studies. The outcomes extracted included all-cause mortality, hospitalization, and critical or severe condition. The critical condition consisted of respiratory failure, endotracheal tube intubation, major adverse cardiovascular events, septic shock, and any admission to the intensive care unit (ICU). All articles were reviewed to identify duplicates and determine whether subgroup analyses were used. Subgroup analysis data were included if they met the inclusion criteria and comprised our outcomes of interest. Two investigators (Y.C.L. and T.S.L.) checked the data extraction tasks and independently performed critical appraisal to confirm a random selection and accuracy of screening articles. Discrepancies in the data extraction or quality assessment of included studies between two investigators were discussed with two other senior investigators (T.S.C. and Y.K.T) to achieve a consensus if a decision could not be made. Two investigators (Y.C.L. and T.S.L.) assessed the quality of the included studies using the Newcastle-Ottawa scale (NOS).¹⁷ NOS scores of more than six suggested high-quality literature.

Study endpoints

COVID-19 infection was diagnosed as a positive result on a reverse-transcriptase-polymerase chain reaction (RT-PCR) assay.⁴ The primary outcome was all-cause mortality related to COVID-19 infection. Secondary outcomes were risks of any hospitalization and critically ill conditions, comprising respiratory failure, endotracheal tube intubation, major adverse cardiovascular events, sepsis, septic shock, and any admission to ICU.^18,19

Statistical analysis

We used the software RevMan 5.4 (Cochrane Collaboration, 2020) to calculate a weighted estimate effect size of the individual studies. The inverse–variance weighting method was used for the fixed-effect model and the DerSimonian and Laird method for the random-effect model. The effect size measure for dichotomous outcomes, such as all-cause mortality, any hospitalization, and critical condition, is pooled odds ratio (OR) with the associated 95% confidence interval (CI). We also undertook subgroup analyses on studies with or without multivariable adjustment. The heterogeneity of effect size estimates within these studies was quantified by using the X² (Cochran Q) statistic and the I² test. The I² statistic ranged from 0% to 100%, and a value of I² > 50% was considered to indicate significant heterogeneity. We performed a pooled analysis with random effect models if heterogeneity was significant and substantial variations in baseline characteristics were found among the included studies. Sensitivity analyses by removing studies with small numbers of CKD and of lower quality (NOS score <8) were conducted. Publication bias was evaluated using a funnel plot with the Egger regression test (where at least five studies were available) and Begg’s test. Significant publication bias was determined if p < 0.05.

Results

Literature assessment and screening

Of the 1837 screened articles, 434 relevant full-text articles were selected after the removal of duplicate articles, protocols, case reports, reviews, protocols, and unavailable abstracts. After screening, 27 articles were included for further analysis.^20–46 The process of selection of the included studies is shown in Figure 1.

Figure 1.

Flow chart of the process to identify eligible studies, with reasons for inclusion or exclusion.

Characteristics and quality of studies

A total of 77,856 patients was identified; 3922 patients with CKD were assigned to the CKD group, and 73,934 patients were assigned to the non-CKD group. The age of patients was between 20 and 95 years and the subjects were predominantly men (42.9–85%). Among 27 included studies, there were 3 prospective cohort, 10 retrospective cohort, two cross-sectional, and 12 retrospective case series investigations. The basic characteristics of the included studies are summarized in Table 1. All included studies received NOS quality scores ranging from 6 to 9, suggesting high quality. Detailed descriptions of quality assessment of included studies are summarized in Table 2.

Table 1.

Basic characteristics of included studies in this systematic review and meta-analysis.

Study	Publication date	Country/city	Study type	Sample size	Age (year) [median (IQR)]	Female (%)	CKD patients (%)	Baseline serum creatinine, mg/dl [median (IQR)]	Outcomes
Okoh et al.²⁰	2 June 2020	US/New Jersey	Retrospective, cohort study	251	62 (49–74)	122 (49)	46 (18.3)	NA	1
Dawei Wang et al.²¹	14 April 2020	China/Wuhan	Retrospective, case series	107	51 (36–65)	50 (46.7)	3 (2.8)	0.80 (0.68–0.97)	1
Ciceri et al.²²	10 June 2020	Italy/Milan	Retrospective, cohort study	410	65 (56–75)	111 (27.1)	47 (11.8)	1.02 (0.84–1.25)	1
Grasselli et al.²³	15 July 2020	Italy/Milan	Retrospective, cohort study	3988	63 (56–69)	800 (20.1)	87 (2.2)	NA	1, 2
Iaccarino et al.²⁴	24 May 2020	Italy	Cross-sectional, multicenter	1591	66.5 (0.4) [mean (SD)]	572 (36)	87 (5.5)	NA	1
Barman et al.²⁵	24 May 2020	Turkey/Istanbul	Retrospective, cohort study	607	68.5 (13.4) [mean (SD)]	273 (44.9)	57 (9.4)	0.90 (0.8–2.0)	1
Nikpouraghdam et al.²⁶	9 April 2020	Iran/Tehran	Retrospective, cohort study	2964	NA	1009 (34)	18 (0.6)	NA	1
Marcello et al.²⁷	23 June 2020	US/New York	Retrospective, cohort study	13,442	52.7 (39.5–64.5)	5961 (44.0)	809 (6.0)	NA	1, 3
Shi et al.²⁸	6 May 2020	China/Wuhan	Retrospective, cohort study	671	63 (50–72)	349 (52)	28 (4.2)	0.65 (0.54–0.79)	1
Gupta et al.²⁹	15 July 2020	US	Prospective, cohort study	2215	60.5 (14.5) [mean (SD)]	779 (35.2)	280 (12.6)	1.0 (0.8–1.5)	1
Mikami et al.³⁰	11 June 2020	US/New York	Retrospective, cohort study	6493	59 (43–72)	2955 (45.5)	525 (8.1)	NA	1, 3
Tao Chen et al.³¹	17 March 2020	China/Wuhan	Retrospective case series	274	62 (44–70)	103 (37)	4 (1.4)	0.86 (0.66–1.06)	1
TieLong Chen et al.³²	11 April 2020	China/Wuhan	Retrospective case series	203	54 (20–91)	95 (46.8)	8 (3.9)	0.98 (0.42–12.05)	1
Mani et al.³³	21 May 2020	US/New York	Retrospective case series	184	64.7 (14.9) [mean (SD)]	73 (39.7)	9 (4.9)	NA	1
Yan et al.³⁴	6 April 2020	China/Wuhan	Retrospective, cohort study	193	64 (49–73)	79 (40.9)	4 (2.1)	0.94 (0.74–1.23)	1
Bhargava et al.³⁵	30 May 2020	US/Detroit	Retrospective, cohort study	197	NA	94 (47.7)	34 (17.3)	NA	2
Petrilli et al.³⁶	14 May 2020	US/New York	Prospective, cohort study	5279	49.5 (32–69).	2664 (50.5)	647 (12.3)	1.0 (0.80–1.39)	2, 3
Khamis et al.³⁷	1 June 2020	Oman	Retrospective, case series	66	48 (16) [mean (SD)]	10 (15.0)	4 (6.4)	NA	2
Suleyman et al.³⁸	16 June 2020	US/Detroit	Retrospective, case series	463	57.5 (16.8) [mean (SD)]	259 (55.9)	182 (39.3)	1.1 (0.84–1.54)	2, 3
Helms et al.³⁹	17 April 2020	French	Prospective, cohort study	222	63 (53–71)	47 (21.1)	19 (8.6)	NA	2
Luwen Wang et al.⁴⁰	24 March 2020	China/Wuhan	Retrospective, case series	116	54 (38–69)	49 (42.2)	5 (4.3)	NA	2
Argenziano et al.⁴¹	18 May 2020	US/New York	Retrospective, case series	1000	63.0 (50.0–75.0)	404 (40.4)	137 (13.7)	NA	2
Salomon et al.⁴²	18 May 2020	Mexico	Retrospective, case series	36,182	NA	NA	820 (2.2)	NA	2, 3
Aggarwal et al.⁴³	16 April 2020	US	Retrospective, case series	16	67.0 (38–95)	4 (25)	6 (38)	1.22 (0.79–7.68)	2
Zhao et al.⁴⁴	1 April 2020	China/Hubei	Retrospective, case series	91	46.0 (NA)	42 (46.2)	1 (1.1)	NA	2
Killerby et al.⁴⁵	26 June 2020	US	Retrospective, case series	531	Non-hospitalized:45.0 (33–58) hospitalized:61.0 (45–70)	303 (57.1)	45 (8.4)	NA	3
Duanmu et al.⁴⁶	24 April 2020	US	Cross-sectional	100	45 (32–65)	44 (44.0)	10 (10.0)	NA	3

Outcome 1: All-cause mortality, 2: Critical or severe condition, 3: Hospitalization.

CKD, IQR, interquartile range; NA, no application; SD, standard deviation; US, United States.

Table 2.

Summary of quality assessment of included studies using NOS scores.

Prospective and retrospective cohort studies
Study	Selection				Comparability	Outcome			Score
Study	Representativeness of exposed cohort	Selection of non-exposed cohort	Ascertainment of exposure	Demonstration of interest outcome	Comparability of cohorts on the basis of the design	Assessment of outcome	follow-up duration for outcomes	Adequacy of follow up (>4 week)	Score
Okoh et al.²⁰	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Ciceri et al.²²	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Grasselli et al.²³	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Barman et al.²⁵	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Nikpouraghdam et al.²⁶	✦	✦	✦	✦	✦✦	✦	-	-	7
Marcello et al.²⁷	✦	✦	✦	✦	✦✦	✦	✦	-	8
Shi et al.²⁸	✦	✦	✦	✦	✦✦	✦	✦	-	8
Gupta et al.²⁹	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Mikami et al.³⁰	✦	✦	✦	✦	✦✦	✦	-	-	7
Yan et al.³⁴	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Bhargava et al.³⁵	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Petrilli et al.³⁶	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Helms et al.³⁹	✦	✦	✦	✦	✦✦	✦	✦	✦	9
Retrospective case series
Study	Selection			Ascertainment			Outcome		Score
Study	Adequate definition and number of cases (n > 30)	Population representation (multi-centers)		Adequate test	Adequate confirmation of comorbidity		Adequately reported outcome	Sufficient follow-up duration (>2 weeks)	Score
Dawei Wang et al.²¹	✦	-		✦	✦✦		✦✦	✦	7
Tao Chen et al.³¹	✦	-		✦	✦✦		✦✦	✦	7
TieLong Chen et al.³²	✦	-		✦	✦✦		✦✦	✦	7
Mani et al.³³	✦	-		✦	✦✦		✦✦	-	6
Khamis et al.³⁷	✦	-		✦	✦✦		✦✦	✦	7
Suleyman et al.³⁸	✦	✦		✦	✦✦		✦✦	✦	8
Luwen Wang et al.⁴⁰	✦	-		✦	✦✦		✦✦	✦	7
Argenziano et al.⁴¹	✦	-		✦	✦✦		✦✦	✦	7
Salomon et al.⁴²	✦	✦		✦	✦✦		✦✦	-	7
Aggarwal et al.⁴³	-	-		✦	✦✦		✦✦	✦	6
Zhao et al.⁴⁴	✦	-		✦	✦✦		✦✦	✦	7
Killerby et al.⁴⁵	✦	✦		✦	✦✦		✦✦	✦	8
Cross-sectional studies
Study	Selection				Comparability		Outcome		Scores
Study	Representativeness of samples	Sample size (n > 30)	Non-respondents	Ascertainment of exposure	Comparability		Assessment of outcome	Statistical test	Scores
Iaccarino et al.²⁴	✦	✦	✦	✦	✦✦		✦	✦	8/10
Duanmu et al.⁴⁶	✦	✦	✦	✦	✦✦		✦	✦	8/10

NOS, Newcastle-Ottawa scale.

All-cause mortality

Of the 22,578 patients with COVID-19 infection in 15 of the included studies,^20–34 a total of 6315 patients died during the study period: 725 patients in the CKD group and 5590 patients in the non-CKD group. The heterogeneity test showed moderate heterogeneity among these studies (I² = 43%), and a random-effects model was used for this meta-analysis. The pooled analyses of all included studies and studies with multivariable adjustment showed a significantly higher risk of all-cause mortality in CKD patients than in those without CKD (OR 2.25, 95% CI 1.91–2.66, p < 0.001; OR 2.70, 95% CI 2.06–3.54, p < 0.001; respectively) (Figure 2).

Figure 2.

Forest plot of all-cause mortality of COVID-19 infection between CKD and non-CKD patients.

Sensitivity tests were conducted by removing small studies with fewer than 30 CKD patients each and or lower quality (NOS score <8) studies; the results of all-cause mortality remained similar (OR 2.18, 95% CI 1.84–2.59, p < 0.001, Figure 3; OR 2.42, 95% CI 1.85–3.17, p < 0.001, Figure 4).

Figure 3.

Forest plot of all-cause mortality of COVID-19 infection between CKD and non-CKD patients after a sensitivity test with removing small studies.

Figure 4.

Forest plot of all-cause mortality of COVID-19 infection between CKD and non-CKD patients after a sensitivity test with removing lower quality (NOS score <8) studies.

Hospitalization

Analysis of hospitalization was performed in seven studies.^{27,30,36,38,42,45,46} Among 62,490 patients with COVID-19, a total of 25,906 patients were hospitalized during the study period: 2520 patients in the CKD group and 23,386 patients in the non-CKD group. The heterogeneity test showed high heterogeneity among these studies (I² = 78%), and a random-effects model was used. The pooled analyses of all included studies and studies with multivariable adjustment showed a significantly higher risk of hospitalization in patients with CKD than in those without CKD (OR 4.29, 95% CI 2.93–6.28, p < 0.001; OR 2.59, 95% CI 1.92–3.51, p < 0.001; respectively) (Figure 5).

Figure 5.

Forest plot of hospitalization of COVID-19 infection between CKD and non-CKD groups.

Critically ill condition

In our meta-analysis, information on the critical or severe condition was available in 11 studies.^23,35–44 Of the 21,387 patients with COVID-19 infection, 5411 patients suffered from critically ill condition during the study period: 507 patients in the CKD group and 4904 patients in the non-CKD group. The heterogeneity test showed high heterogeneity among these studies (I² = 90%), and a random-effects model was used. Patients with CKD had a higher risk of critically ill conditions than those without CKD in the pooled analysis of studies with multivariable adjustment (adjusted OR 2.12, 95% CI 0.95 to 4.77, p = 0.07) and in the analysis of all included studies (OR 1.27, 95% CI 0.71 to 2.26, p = 0.41), but both analyses did not attain statistical significance (Figure 6).

Figure 6.

Forest plot of critically ill condition (including respiratory failure, endotracheal tube intubation, major adverse cardiovascular events, sepsis, septic shock, and any admission in the ICU) of COVID-19 infection between CKD and non-CKD groups.

Assessment of publication bias

Publication bias was evaluated in the outcomes of all-cause mortality, hospitalization, and critically ill condition by funnel plots. Egger’s regression test and Begg’s test showed no significant publication bias (p > 0.05) (Figure 7).

Figure 7.

Funnel plot for publication bias assessment. (a) All-cause mortality, (b) hospitalization, (c) critically ill condition.

Discussion

As far as we know, this is the first systematic review and meta-analysis to assess outcomes of COVID-19 infection in patients with CKD in the initial pandemic period. After integration of data from the included studies, our pooled analysis of all included studies and subgroup analyses of studies with multivariable adjustment for subjects with COVID-19 infection revealed that patients with CKD had a significantly increased risk of all-cause mortality and hospitalization compared with those without CKD. Patients with CKD suffering from COVID-19 infection also had a higher risk of progressing to a critically ill condition than those without CKD in the pooled analysis of included studies and subgroup analyses of studies with multivariable adjustment, though neither result achieved statistical significance. These results indicate CKD as a strong risk factor of grave outcomes of COVID-19 infection

Patients with CKD, having a higher risk of the severe disease due to higher incidence rate of infections and cardiovascular disease than in the general population, have been regarded as having immunocompromised status due to functional defects of the innate and adaptive immune system, leading to frequent infectious complications.^47,48 Changes in the immune system of patients with CKD include mainly phagocytic dysfunction of B and T cells and the increased reaction of pro-inflammatory cytokines and inflammatory monocytes; these may gradually progress as renal function declines.^49,50 Some investigations have shown that this chronic systemic inflammation contributes to higher morbidity and mortality in CKD patients.^12,51,52 In our study, patients with CKD also had a higher risk of mortality, hospitalization, and critical condition. Hence, clinicians should pay more medical attention to this population in COVID-19 infection and may consider earlier hospitalization to help prevent disease deterioration and spread.

Renal involvement has been reported in patients with COVID-19 infection, supported by the findings of PCR products of coronavirus in both blood and urine samples.^6–8 The etiology of kidney involvement in patients with COVID-19 may be associated with direct cytopathic effects through the angiotensin-converting enzyme 2 (ACE2)-dependent pathway, with increased expression of ACE2 in patients with CKD, as a cell entry receptor of coronavirus, and indirect effect of viral infection related cytokines or mediators on renal tissues.^4,53,54 Of note, predisposed CKD is recognized as a risk factor for the development of AKI, which is associated with an increased risk of progressive CKD, end-stage renal disease (ESRD), and mortality.⁵⁵ Thus, early detection of kidney injury in COVID-19 infection should be made in patients with CKD, thereby allowing timely adequate medical strategies to prevent progression to poor outcomes.

Due to the lack of approved vaccine or specific therapies against COVID-19 in the initial pandemic period of COVID-19 infection, the principle of management for COVID-19 infection in patients with CKD was supportive care, similar to the general population.^56,57 Besides being quarantined at the initial COVID-19 infection, maintenance of stable hemodynamic status, adequate oxygenation supply, closely following up changes in renal function, and prevention using renal toxicity medicine should be performed in COVID-19 infected patients with CKD.⁵⁸ More large clinical trials are needed to clarify the effect and safety of medicine against COVID-19, such as a vaccines, and antiviral or anti-inflammatory agents, particularly in patients with CKD due to their insufficient ability to excrete drugs.

Although our study analyzed clinical outcomes with a large sample size of patients, some limitations still exist. First, the total sample size of patients with CKD was relatively small in some included studies, and this may reduce the significance of the results. Second, the causes of pre-existing CKD and serum creatinine level were not clearly stated in the included studies. Therefore, our study did not explore the potential difference in outcomes among various etiologies or stages of CKD. Third, the exact information of other coexisting illnesses beyond CKD, such as diabetes mellitus, hypertension, cardiovascular disease, and detailed characteristics, such as age or sex, in included studies was insufficient. To examine the impact of potential confounding, we conducted subgroup analyses of studies with or without multivariable adjustment, which comprises age, sex, diabetes mellitus, hypertension, cardiovascular disease, etc. We observed small differences in the pooled estimates between adjusted and non-adjusted studies. More large-scale and higher-quality studies are needed to further confirm the influence of COVID-19 on outcomes in patients with CKD in the future.

In summary, patients with CKD had a significantly increased risk of all-cause mortality and hospitalization compared with those without CKD. Clinicians should pay more medical attention to this population in COVID-19 infection and apply timely adequate medical strategies to prevent progression to poor outcomes.

Supplemental Material

sj-doc-1-taj-10.1177_2040622321998860 – Supplemental material for Outcomes of coronavirus 2019 infection in patients with chronic kidney disease: a systematic review and meta-analysis

Supplemental material, sj-doc-1-taj-10.1177_2040622321998860 for Outcomes of coronavirus 2019 infection in patients with chronic kidney disease: a systematic review and meta-analysis by Yi-Chih Lin, Tai-Shuan Lai, Shuei-Liong Lin, Yung-Ming Chen, Tzong-Shinn Chu and Yu-Kang Tu in Therapeutic Advances in Chronic Disease

Supplemental Material

sj-pdf-2-taj-10.1177_2040622321998860 – Supplemental material for Outcomes of coronavirus 2019 infection in patients with chronic kidney disease: a systematic review and meta-analysis

Supplemental material, sj-pdf-2-taj-10.1177_2040622321998860 for Outcomes of coronavirus 2019 infection in patients with chronic kidney disease: a systematic review and meta-analysis by Yi-Chih Lin, Tai-Shuan Lai, Shuei-Liong Lin, Yung-Ming Chen, Tzong-Shinn Chu and Yu-Kang Tu in Therapeutic Advances in Chronic Disease

Footnotes

Acknowledgements

The authors thank the Institute of Epidemiology and Preventive Medicine, College of Public Health, National Taiwan University, Taipei, Taiwan and Division of Nephrology, Department of Internal Medicine, National Taiwan University Hospital and College of Medicine, Taipei, Taiwan, for their analytical support in this study.

Authors’ contributions

Research idea and study design: Y.-C.L., T.-S.L., Y.-K.T.; data acquisition: Y.-C.L., T.-S.L. S.-L.L., Y.-M.C., T.-S.C.; data analysis and interpretation: Y.-C.L., T.-S.L., Y.-K.T.; statistical analysis: Y.-C.L., Y.-K.T.; supervision or mentorship: T.-S.L., Y.-K.T.. Y.-C.L., T.-S.L., Y.-K.T. provided critical contributions to the data analysis and were the major contributors in writing the manuscript. All authors read and approved the final manuscript.

Funding

The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This project was partially funded by a grant from the Ministry of Science & Technology in Taiwan (grant number: MOST 109-2314-B-002-150-MY3).

Conflict of interest statement

The authors declare that there is no conflict of interest.

ORCID iD

Yi-Chih Lin

Supplemental material

Supplemental material for this article is available online.

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