1. Department of Preventive Medicine and Public Health; School of Medicine and Health Sciences; University of Oviedo; Oviedo Spain
2. Department of Nursing; School of Medicine and Health Sciences; University of Oviedo; Oviedo Spain
3. School of Public Health; Curtin University; Perth WA Australia
4. Instituto de Investigación del Principado de Asturias (IISPA); Oviedo Spain