title: Metal ring - a safe, effective, economical and convenient approach of fertility regulation.
mesh_terms: D000028:Abortion, Induced; D001208:Asia; D001723:Birth Rate; D002681:China; D003267:Contraception; D003268:Contraception Behavior; D003274:Contraceptive Devices, Female; D003625:Data Collection; D003710:Demography; D003906:Developing Countries; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D005202:Asia, Eastern; D005298:Fertility; D010298:Parity; D011153:Population; D011157:Population Dynamics; D012106:Research; D012494:Sampling Studies; D013812:Therapeutics
keywords: Abortion, Induced; Asia; China; Contraception; Contraception Continuation; Contraception Failure; Contraceptive Methods; Contraceptive Usage; Demographic Factors; Developing Countries; Eastern Asia; Evaluation; Family Planning; Fertility; Fertility Control, Postconception; Fertility Measurements; Insertion; Parity; Population; Population Dynamics; Research Methodology; Sampling Studies; Studies; Surveys; Treatment; Vaginal Rings