1. EPIUnit, Institute of Public Health, University of Porto, Porto, Portugal/Department of Clinical Epidemiology, Predictive Medicine and Public Health, University of Porto Medical School, Porto, Portugal/Entre Douro e Vouga Hospital Centre, Santa Maria da Feira, Portugal
2. University of Florence, Florence, Italia
3. EPIUnit, Institute of Public Health, University of Porto, Porto, Portugal/Department of Clinical Epidemiology, Predictive Medicine and Public Health, University of Porto Medical School, Porto, Portugal
4. University of Catania, Catania, Italia
5. University of Padova, Padova, Italia
6. Gallarate Hospital, Gallarate, Italia
7. Spedali Civili Brescia, Brescia, Italia
8. University of Bari, Bari, Italia