title: Two oral contraceptives with the same gestagen and different estrogen. A controlled clinical trial.
mesh_terms: D002986:Clinical Trials as Topic; D004338:Drug Combinations; D004341:Drug Evaluation; D004997:Ethinyl Estradiol / Q000009:adverse effects / Q000494:pharmacology*; D005260:Female; D006801:Humans; D008598:Menstruation / Q000187:drug effects*; D008599:Menstruation Disturbances / Q000139:chemically induced; D008656:Mestranol / Q000009:adverse effects / Q000494:pharmacology*; D009640:Norethindrone / Q000009:adverse effects / Q000494:pharmacology*
chemical_list: D004338:Drug Combinations; D004997:Ethinyl Estradiol; D008656:Mestranol; D009640:Norethindrone