Population and fertility by age and sex for 195 countries and territories, 1950-2017: a systematic analysis for the Global Burden of Disease Study 2017 - Murray, Christopher J. L; Callender, Charlton S. K. H; Kulikoff, Xie Rachel; Srinivasan, Vinay; Abate, Degu; Abate, Kalkidan Hassen; Benseñor, Isabela Judith Martins; Lotufo, Paulo Andrade; Polanczyk, Guilherme Vanoni; Santos, Itamar de Souza (Lancet, 2018)