1 CONAHCYT-National Cancer Institute, Mexico City 14080, Mexico. Electronic address: karlaunger@gmail.com.
2 Center for Research on Population Health, National Institute of Public Health, Mexico City, Mexico; Department of Global Health and Population, Harvard T H Chan School of Public Health, Boston, MA, USA.
3 Department of Global Health and Population, Harvard T H Chan School of Public Health, Boston, MA, USA.