1. Faculty of Medicine and Surgery, University of Sassari (UNISS), Viale San Pietro 43/B, 07100 Sassari, Italy
2. Department of Medical Sciences and Public Health, University of Cagliari, Cittadella Universitaria di Monserrato, 09042 Cagliari, Italy
3. Mater Olbia Hospital, Strada Statale 125 Orientale Sarda, 07026 Olbia, Italy
4. Centre for Interdisiplinary Research in Health, Universidade Católica Portuguesa, 4169-005 Porto, Portugal
5. Department of Community Nursing, Preventive Medicine and Public Health and History of Science, University of Alicante, 03690 San Vicente del Raspeig, Spain