User's perception of the contraceptive vaginal ring: a field study in Brazil and the Dominican Republic.
D000293:Adolescent; D000328:Adult; D001938:Brazil; D003268:Contraception Behavior; D003271:Contraceptive Agents, Female / Q000008:administration & dosage* / Q000009:adverse effects; D003273:Contraceptive Devices / Q000009:adverse effects / Q000706:statistics & numerical data*; D003276:Contraceptives, Oral / Q000008:administration & dosage / Q000009:adverse effects; D003277:Contraceptives, Oral, Combined / Q000008:administration & dosage; D004293:Dominican Republic; D004958:Estradiol / Q000008:administration & dosage*; D005193:Family Planning Services; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D016912:Levonorgestrel; D009644:Norgestrel / Q000008:administration & dosage*; D012826:Silicone Elastomers; D011795:Surveys and Questionnaires
D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D012826:Silicone Elastomers; D009644:Norgestrel; D004958:Estradiol; D016912:Levonorgestrel