title: Progestogen safety in multiple gestations: application of the Bradford Hill criteria.
authors.affiliation: Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, University of Kentucky, Lexington, KY, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: O'Brien
mesh_terms: D000077713:17 alpha-Hydroxyprogesterone Caproate; D016907:Adverse Drug Reaction Reporting Systems; D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D006908:Hydroxyprogesterones / Q000008:administration & dosage* / Q000009:adverse effects*; D015201:Meta-Analysis as Topic; D064887:Observational Studies as Topic; D011247:Pregnancy; D011272:Pregnancy, Multiple; D047928:Premature Birth / Q000517:prevention & control*; D011372:Progestins / Q000008:administration & dosage* / Q000009:adverse effects*; D016032:Randomized Controlled Trials as Topic; D018570:Risk Assessment; D016896:Treatment Outcome
chemical_list: D006908:Hydroxyprogesterones; D011372:Progestins; D000077713:17 alpha-Hydroxyprogesterone Caproate