title: Invited commentary: Rare side effects of obstetric interventions: are observational studies good enough?
authors.affiliation: Department of Maternal and Child Health, School of Public Health, University of North Carolina at Chapel Hill, 27599-7400, USA. Pierre_Buekens@unc.edu
authors.forename: P
authors.initials: P
authors.lastname: Buekens
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D005113:Extraction, Obstetrical / Q000009:adverse effects* / Q000295:instrumentation / Q000379:methods; D005260:Female; D006801:Humans; D019370:Observation / Q000379:methods; D018579:Patient Selection; D011247:Pregnancy; D011256:Pregnancy Outcome / Q000453:epidemiology; D015203:Reproducibility of Results; D012107:Research Design / Q000592:standards*; D012307:Risk Factors; D016037:Single-Blind Method