title: Contraceptive rings; self-administered treatment governed by bleeding.
mesh_terms: D003274:Contraceptive Devices, Female / Q000009:adverse effects*; D005260:Female; D006801:Humans; D009644:Norgestrel / Q000097:blood; D010060:Ovulation; D011376:Progesterone-Binding Globulin / Q000097:blood; D012826:Silicone Elastomers / Q000494:pharmacology; D013997:Time Factors; D014592:Uterine Hemorrhage / Q000209:etiology*
chemical_list: D011376:Progesterone-Binding Globulin; D012826:Silicone Elastomers; D009644:Norgestrel