1. Department of Medical Sciences and Public Health, University of Cagliari, 09042 Cagliari, Italy
2. Nursing Program, Faculty of Health Sciences, Universidad Popular del Cesar, Valledupar 200002, Colombia
3. Chair of Public Health, La Sapienza University, Rome, Italy 00185 Rome, Italy
4. Department of Surgical Sciences, University of Cagliari, 09042 Cagliari, Italy