The coupon system in an ongoing family planning program.
D003201:Computers; D003657:Decision Making; D005193:Family Planning Services; D005251:Fees, Medical; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007434:Intrauterine Devices; D008499:Medical Records; D008722:Methods; D011996:Records; D013624:Taiwan