title: Collagen bands: a new vaginal delivery system for contraceptive steroids.
mesh_terms: D003094:Collagen / Q000494:pharmacology*; D003274:Contraceptive Devices, Female; D004958:Estradiol / Q000097:blood / Q000494:pharmacology*; D005260:Female; D006801:Humans; D009644:Norgestrel / Q000097:blood / Q000494:pharmacology*; D012826:Silicone Elastomers / Q000494:pharmacology; D014592:Uterine Hemorrhage / Q000209:etiology; D014621:Vagina / Q000502:physiology*
chemical_list: D012826:Silicone Elastomers; D009644:Norgestrel; D004958:Estradiol; D003094:Collagen