Literature search
To ensure that the work was of high quality, this study was performed
following the Meta-Analysis of Observational Studies in Epidemiology
(MOOSE) guidelines[13] (Table S1). English-language publications
were comprehensively searched in the Cochrane Library, PubMed, and
EMBASE databases from the dates of inception until May 2021. The search
terms used were “pregnancy OR mothers OR pregnant OR gestational OR
prenatal OR perinatal OR gestation” and “neuraminidase inhibitors OR
oseltamivir OR zanamivir.” The reference lists of the retrieved
articles were manually examined to identify studies not found in the
database search.