title: A study on IUD retention by curve-fitting.
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D005193:Family Planning Services; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D008593:Menopause; D008875:Middle Aged; D011247:Pregnancy; D011336:Probability; D013223:Statistics as Topic; D013624:Taiwan; D013997:Time Factors