Doubova Svetlana V, Pérez-Cuevas Ricardo
Epidemiology and Health Services Research Unit, CMN Siglo XXI, Mexican Institute of Social Security, Mexico City, Mexico 06725.
Health System Research Center, National Institute of Public Health, Cuernavaca City, Mexico.
Lancet. 2018 Jun 2;391(10136):2190-2192. doi: 10.1016/S0140-6736(18)30987-5. Epub 2018 May 24.