1. Department of Internal Medicine, Virgen del Rocío University Hospital, Seville, Spain
2. Department of Internal Medicine, San Juan de Dios Hospital, Seville, Spain
3. Department of Internal Medicine, Virgen Macarena University Hospital, Seville, Spain
4. Department of Nursing, Pharmacology, and Physiotherapy, University of Cordoba, Córdoba, Spain
5. Department of Internal Medicine, Infanta Elena Hospital, Huelva, Spain
6. Department of Internal Medicine, Serranía de Ronda Hospital, Málaga, Spain
7. Department of Internal Medicine, Regional University Hospital of Malaga, Málaga, Spain
8. Faculty of Labour Sciences, Department of Sociology, Social Work and Public Health, University of Huelva, Huelva, Spain
9. Safety and Health Postgraduate Programme, Universidad Espíritu Santo, Guayaquil, Ecuador
10. Department of Medicine, University of Seville, Seville, Spain.