1. Epidemiology and Health Services Research Unit, CMN Siglo XXI, Mexican Institute of Social Security, Av. Cuauhtemoc 330, Col. Doctores, Del. Cuauhtemoc, Mexico City, Mexico
2. General Directorate for Quality of Healthcare and Education, Ministry of Health, Mexico City, Mexico
3. Health System Research Center, National Institute of Public Health, Cuernavaca, Mexico
4. Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, USA
5. Bona Dea Salud, Mexico City, Mexico
6. Center for Evaluation and Surveys, National Institute of Public Health, Cuernavaca, Mexico
7. Institute of Social Research, National Autonomous University of Mexico, Mexico City, Mexico