title: A birth duration fertility model with consideration of contraception factors.
mesh_terms: D001208:Asia; D002681:China; D003267:Contraception; D036861:Delivery, Obstetric; D003710:Demography; D003906:Developing Countries; D005193:Family Planning Services; D005202:Asia, Eastern; D005298:Fertility; D008962:Models, Theoretical; D011153:Population; D011157:Population Dynamics; D011247:Pregnancy; D011256:Pregnancy Outcome; D012098:Reproduction; D012106:Research; D013997:Time Factors
keywords: Asia; China; Contraception; Delivery; Demographic Factors; Developing Countries; Eastern Asia; Family Planning; Fertility; Mathematical Model; Models, Theoretical; Population; Population Dynamics; Pregnancy; Pregnancy Outcomes; Reproduction; Research Methodology; Theoretical Studies; Time Factors