CDCMMWR. Severe outcomes among patients with coronavirus disease 2019 (COVID-19) — United States, February 12–March 16. MMWR Morb Mortal Wkly Rep. 2020;2020:69
3.
ZhouF.YuT.DuRet al. Clinical course and risk factors for mortality of adult inpatients with COVID-19 in Wuhan, China: a retrospective cohort study. Lancet. 2020;395(10229):1054-1062.doi:10.1016/S0140-6736(20)30566-3http://www.ncbi.nlm.nih.gov/pubmed/32171076