title: [A randomized, multi-center comparative study of 3 types of IUD (2 years follow-up)].
mesh_terms: D001208:Asia; D001695:Biology; D001769:Blood; D002681:China; D003267:Contraception; D003268:Contraception Behavior; D003710:Demography; D003906:Developing Countries; D004194:Disease; D005193:Family Planning Services; D005202:Asia, Eastern; D005500:Follow-Up Studies; D006454:Hemoglobins; D006470:Hemorrhage; D007239:Infections; D007434:Intrauterine Devices; D007435:Intrauterine Devices, Copper; D010827:Physiology; D011153:Population; D011157:Population Dynamics; D012106:Research; D012816:Signs and Symptoms; D013812:Therapeutics; D013997:Time Factors
chemical_list: D006454:Hemoglobins
keywords: Asia; Biology; Bleeding; China; Comparative Studies; Contraception; Contraception Continuation; Contraception Failure; Contraceptive Methods; Contraceptive Usage; Demographic Factors; Developing Countries; Diseases; Eastern Asia; Family Planning; Follow-up Studies; Hemic System; Hemoglobin Level--changes; Infections; Insertion; Iud; Iud, Copper Releasing; Iud, Unmedicated; Physiology; Population; Population Dynamics; Research Methodology; Signs And Symptoms; Studies; Time Factors; Treatment