title: Selection Bias Due to Parity-conditioning in Studies of Time Trends in Fertility.
authors.affiliation: Department of Epidemiology and Biostatistics, Imperial College London, St. Mary's Campus, London, United Kingdom, m.joffe@imperial.ac.uk.
authors.forename: Michael
authors.initials: M
authors.lastname: Joffe
mesh_terms: D005260:Female; D005298:Fertility; D006801:Humans; D010298:Parity; D011247:Pregnancy; D012107:Research Design; D015983:Selection Bias