1. School of Medicine; Universidad de Valparaíso; Viña del Mar Chile
2. Interdisciplinary Centre for Health Studies (CIESAL); Universidad de Valparaíso; Viña del Mar Chile
3. Research Department; Instituto Universitario Hospital Italiano de Buenos Aires; Buenos Aires Argentina
4. School of Medicine; Universidad Andrés Bello; Viña del Mar Chile
5. Department of Public Health-CIGES; Faculty of Medicine, Universidad de La Frontera; Temuco Chile