1. School of Social Work, Pontifical Catholic University of Chile, Santiago, Chile
2. Department of Family Medicine, School of Medicine, Pontifical Catholic University of Chile, Santiago, Chile
3. Division of Surgery, Center of Experimental Surgery and Simulation, School of Medicine, Pontifical Catholic University of Chile, Santiago, Chile
4. Centro de Salud Familiar, San Clemente, Chile
5. Centro de Salud Familiar Chiguayante, Chiguayante, Chile
6. Division of Cardiovascular Diseases, School of Medicine, Pontifical Catholic University of Chile, Santiago, Chile
7. Fred Hutchinson Cancer Center, Cancer Prevention Program, Public Health Sciences Division, Seattle, WA, USA