1 Preventive Medicine and Public Health, University of Santiago de Compostela, Santiago de Compostela, Spain.
2 Health Research Institute of Santiago de Compostela (IDIS-Instituto de Investigación Sanitaria de Santiago de Compostela), Santiago de Compostela, Spain.
3 Consortium for Biomedical Research in Epidemiology and Public Health (CIBER en Epidemiología y Salud Pública/CIBERESP), Madrid, Spain.