Kyu, H, Abate, D, abate, K, abay, S, Abbafati, C, Abbasi, N & Abbastabar, H & Sheikh, A 2018, ' Global, regional, and national disability-adjusted life-years (DALYs) for 359 diseases and injuries and healthy life expectancy (HALE) for 195 countries and territories, 1990–2017: a systematic analysis for the Global Burden of Disease Study 2017 ', The Lancet, vol. 392, no. 10159, pp. 1859-1922 . https://doi.org/10.1016/S0140-6736(18)32335-3