1. Center for Population Health Research, National Institute of Public Health, Cuernavaca, Mexico
2. Center for Research in Evaluation and Surveys, National Institute of Public Health, Cuernavaca, Mexico
3. CONACYT—Instituto Nacional de Salud Pública, Cuernavaca, Mexico
4. Center for Research on Infectious Diseases, National Institute of Public Health, Cuernavaca, Mexico
5. General Director, National Institute of Public Health, Cuernavaca, Mexico