1. Population Health Research Centre, National Institute of Public Health, Cuernavaca, Mexico
2. Carlos Slim Foundation, Mexico City, Mexico
3. Higher University of San Andres, La Paz, Bolivia
4. Epidemiology and Health Services Research Unit, Mexican Institute of Social Security, Cuernavaca, Mexico
5. Research Centre in Policy, Population, and Health, School of Medicine, National Autonomous University of Mexico, Mexico City, Mexico