1. Centro de Estudios de Estado y Sociedad (CEDES); Buenos Aires Argentina
2. Hospital de Clinicas; Universidad de Buenos Aires; Buenos Aires Argentina
3. Facultad de Ciencias Exactas y Naturales; Universidad de Buenos Aires; Buenos Aires Argentina
4. Department of Tobacco Research; Center for Population Health Research; National Institute of Public Health; Cuernavaca Mexico
5. Department of Health and Human Performance; College of Charleston; Charleston South Carolina
6. Department of Epidemiology & Biostatistics; University of South Carolina; Columbia South Carolina
7. Department of Pediatrics; Geisel School of Medicine at Dartmouth; Lebanon New Hampshire