Pregnancy and the risk of severe coronavirus disease 2019 infection: methodological challenges and research recommendations Published on 2022-01-012023-06-19 Journal: BJOG : an international journal of obstetrics and [저자] D A Savitz, A M Bengtson, E Hardy, D B Fell [Category] MERS, SARS, PMC URL Pubmed URL [DOI] 10.1111/1471-0528.16935 [Source] PMC All Keywords