1. Department of Preventive Medicine and Public Health, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
2. Medical Oncology, Complejo Hospitalario Universitario de Santiago, Santiago de Compostela, Spain
3. Health Research Institute of Santiago de Compostela (Instituto de Investigación Sanitaria de Santiago de Compostela – IDIS), Santiago de Compostela, Spain
4. Consortium for Biomedical Research in Epidemiology and Public Health (CIBER en Epidemiología y Salud Pública/CIBERESP), Spain