1. Geriatric Unit, ‘Maggiore’ Hospital, I‑97015 Modica, Italy
2. Geriatric Unit, General Hospital ‘Garibaldi’ Nesima, I‑95123 Catania, Italy
3. Internal Medicine Unit, General Hospital ‘G. Di Maria’, I‑96012 Avola, Italy
4. Infectious Disease Unit, Umberto I Hospital, I‑96100 Siracusa, Italy
5. Division of Internal Medicine and Stroke Care, Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (Promise) ‘G. D'Alessandro’, University of Palermo, I‑90127 Palermo, Italy
6. Department of Biomedical and Dental Science and Morphofunctional Imaging, University of Messina, I‑98122 Messina, Italy
7. Department of Clinical and Experimental Medicine, University of Catania, Internal Medicine Unit, University Hospital ‘G. Rodolico’, I‑95123 Catania, Italy