RosenbaumPRRubinDB. The central role of the propensity score in observational studies for causal effects. Biometrika1983; 70(1): 41–55.
2.
ZaçeDriedaLa GattaEmanuele, et al.The impact of COVID-19 vaccines on fertility-A systematic review and meta-analysis. Vaccine. 2022; 40(42): 6023–6034.