title: Trying to avoid bias in case-control and case-cohort studies.
authors.forename: Paul G
authors.initials: PG
authors.lastname: McDonough
mesh_terms: D016022:Case-Control Studies; D015331:Cohort Studies; D005260:Female; D006062:Gonadotropins / Q000627:therapeutic use; D006801:Humans; D015588:Observer Variation; D010062:Ovulation Induction / Q000592:standards*; D015203:Reproducibility of Results; D027724:Reproductive Techniques, Assisted / Q000592:standards*
chemical_list: D006062:Gonadotropins