1. Department of Internal Medicine, Division of Geriatrics, Istanbul Medical School, Istanbul University, Capa, Istanbul, Turkey
2. Department of Internal Medicine, Division of Geriatrics, Marmara University Hospital, Pendik, Istanbul, Turkey
3. Istanbul Physical Medicine and Rehabilitation Training Hospital, Istanbul, Turkey
4. Department of Internal Medicine, Istanbul Medical School, Istanbul University, Capa, Istanbul, Turkey
5. Servicio de Geriatría, Hospital Universitario Ramón y Cajal, Madrid, Spain