1. Internal Medicine Unit 1, University Hospital Careggi, Florence, Italy
2. Department of Medicine and Surgery, University of Insubria, Varese, Italy
3. U.O.C. General Medicine, Versilia Hospital, Viareggio, Italy
4. Department of Internal Medicine, Hospital of Legnano, Legnano, Italy
5. Hospital of Marcianise, ASL Caserta, Caserta, Italy