title: Intravaginal rings for contraceptive use: an editorial comment.
mesh_terms: D000287:Administration, Topical; D000818:Animals; D002715:Chlormadinone Acetate / Q000494:pharmacology*; D003274:Contraceptive Devices, Female; D004971:Estrus / Q000187:drug effects; D005260:Female; D006801:Humans; D008525:Medroxyprogesterone / Q000494:pharmacology*; D011247:Pregnancy; D012756:Sheep; D014621:Vagina / Q000187:drug effects*
chemical_list: D002715:Chlormadinone Acetate; D008525:Medroxyprogesterone