Field trial with "Lippes' loop".
D000328:Adult; D003267:Contraception; D003710:Demography; D005260:Female; D006801:Humans; D007194:India; D007434:Intrauterine Devices; D011095:Polyethylenes; D011247:Pregnancy; D012959:Socioeconomic Factors
D011095:Polyethylenes