title: Progestagen-releasing vaginal rings--an update.
authors.forename: I D
authors.initials: ID
authors.lastname: Nuttal
authors.forename: M
authors.initials: M
authors.lastname: Elstein
authors.forename: B E
authors.initials: BE
authors.lastname: Spencer
mesh_terms: D001695:Biology; D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003274:Contraceptive Devices, Female; D004467:Economics; D004703:Endocrine System; D005193:Family Planning Services; D006728:Hormones; D016912:Levonorgestrel; D010827:Physiology; D012102:Reproductive Control Agents; D012106:Research; D013672:Technology
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D006728:Hormones; D012102:Reproductive Control Agents; D016912:Levonorgestrel
keywords: Biology; Clinical Research; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Progestin; Contraceptive Methods; Economic Factors; Endocrine System; Family Planning; Hormones; Levonorgestrel; Physiology; Reproductive Control Agents; Research And Development; Research Methodology; Technology; Vaginal Rings