title: Improvement of a d-norgestrel-releasing IUD.
mesh_terms: D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D007436:Intrauterine Devices, Medicated; D008598:Menstruation; D009644:Norgestrel; D010060:Ovulation
chemical_list: D009644:Norgestrel