Fertility, C. G. 2017 P. and. (2018). 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. Lancet (London, England), 392(10159), 1995-2051. https://doi.org/10.1016/S0140-6736(18)32278-5 (Original work published 2018)