title: Eighteen months contraception following subdermal insertion of silastic capsules containing norgestrienone.
mesh_terms: D000328:Adult; D003271:Contraceptive Agents, Female; D004341:Drug Evaluation; D004343:Drug Implants; D005260:Female; D006801:Humans; D009645:Norgestrienone / Q000008:administration & dosage*; D009651:Norpregnatrienes / Q000008:administration & dosage*; D011247:Pregnancy; D013997:Time Factors
chemical_list: D003271:Contraceptive Agents, Female; D004343:Drug Implants; D009651:Norpregnatrienes; D009645:Norgestrienone