1. Department of Primary Care, Local Health Authority of Modena, Modena, Italy
2. Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, Modena, Italy
3. Department of General Practice, University Hospital Wuerzburg, Wuerzburg, Germany
4. Department of Public Health, Local Health Authority of Bologna, Bologna, Italy
5. Local Health Authority of Romagna, Ravenna, Italy