1. California Center for Population Research, University of California Los Angeles, Los Angeles, CA 90095, USA
2. Centro de Análisis y Medición del Bienestar Social, AC, México DF, México
3. Office of Population Research, Princeton University, 243 Wallace Hall, Princeton, NJ 08544, USA
4. California Center for Population Research and Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA 90095, USA
5. Universidad Iberoamericana, AC, México DF, México