The development of NORPLANT implants.
D002986:Clinical Trials as Topic; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage / Q000009:adverse effects; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D009644:Norgestrel / Q000008:administration & dosage* / Q000009:adverse effects; D011247:Pregnancy; D013237:Stereoisomerism
D003277:Contraceptives, Oral, Combined; D009644:Norgestrel; D016912:Levonorgestrel