1. Preventive Medicine and Public Health Department, Faculty of Medicine, University of Seville, Av. Sanchez Pizjuan s/n, 41009 Seville, Spain
2. Department of Preventive Medicine, Hospital Universitario de Valme, Ctra. de Cádiz Km. 548,9, 41014 Seville, Spain
3. Department of Preventive Medicine, Virgen Macarena University Hospital, Avda. Dr. Fedriani 3, 41009 Seville, Spain