Clinical performances and endocrine profilles with contraceptive vaginal rings containing d-norgestrel.
D000293:Adolescent; D000328:Adult; D003274:Contraceptive Devices, Female; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D009644:Norgestrel / Q000097:blood; D014621:Vagina
D009644:Norgestrel