Data Collection and Analysis
Data for each included study including publication and methodological details: journal name and impact factor (from Clarivate Analytics), year of publication, country of the corresponding author, source of funding (e.g. government, philanthropic, industry, etc.), conflict of interest statement (dichotomous), citation rate (number of Google Scholar citations) and type of intervention studied (e.g. prostaglandins, oxytocin, misoprostol, etc.) were independently extracted by two authors (N.W. and M.M.) (Table S1 Pg 1-3). Discrepancies were resolved by discussion and consensus among the authorship team. The list of excluded studies can be found in the online supplement (Table S2 Pg. 4).