title: Multinational comparative clinical evaluation of two long-acting injectable contraceptive steroids: norethisterone oenanthate and medroxyprogesterone acetate. 1. Use-effectiveness.
mesh_terms: D000293:Adolescent; D000328:Adult; D003692:Delayed-Action Preparations; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D007273:Injections, Intramuscular; D008525:Medroxyprogesterone / Q000008:administration & dosage; D009640:Norethindrone / Q000008:administration & dosage / Q000031:analogs & derivatives*; D011247:Pregnancy
chemical_list: D003692:Delayed-Action Preparations; D008525:Medroxyprogesterone; D009640:Norethindrone