1. Division of Infectious Diseases, Department of Internal Medicine, “San Gerardo” Hospital, University of Milan-Bicocca, 20900 Monza, Italy
2. LITA VIALBA, University of Milan, 20157 Milan, Italy
3. Department of Clinical Medicine and Prevention, University of Milan-Bicocca, SCC Geriatrics, 20900 Monza, Italy
4. Geriatric Unit, University of Milan, Fondazione Cà Granda, IRCCS Ospedale Maggiore Policlinico, 20122 Milan, Italy
5. Don C. Gnocchi Foundation, IRCCS, 20148 Milan, Italy