1. Department of Sociology, Social Work and Public Health, Faculty of Labour Sciences, University of Huelva, Huelva, Spain
2. Safety and Health Postgraduate Programme, Universidad Espíritu Santo, Guayaquil, Ecuador
3. Faculty of Medicine, University of Cartagena, Cartagena, Colombia
4. Centro Universitario de Enfermería Cruz Roja, University of Seville, Seville, Spain
5. Department of Economy, University of Huelva, Huelva, Spain