1. Department of General Surgery Complexo Hospitalario de Ourense Ourense Spain
2. Department of Preventive Medicine and Public Health University of Granada Granada Spain
3. Department of General Surgery Hospital de Motril Granada Spain
4. Unidad de Mastología de Grupo Oroño Rosario Argentina
5. CIBER of Epidemiology and Public Health (CIBERESP) Madrid Spain
6. Instituto de Investigación Biosanitaria IBS Granada Spain