1. İstanbul University, İstanbul Faculty of Medicine, Department of Internal Medicine, Division of Geriatrics, İstanbul, Turkey

2. Semmelweis University Faculty of Medicine, Departmental Group of Geriatrics, Division of Internal Medicine and Oncology, Budapest, Hungary

3. Middle-East Academy for Medicine of Aging, Tripoli, Lebanon

4. Mahmoud El Matri Hospital, Ariana, Tunisia

5. Pirogov Russian National Research University, Russian Gerontology Research Centre, Moscow, Russia

6. Policlinque CNSS, Sfax, Tunisia

7. Charles Nicolle Hospital, Clinic of Internal Medicine “B”, Tunis, Tunisia

8. Private Practice, Tunis, Tunisia

9. Peter Držaj Hospital, University Medical Centre Ljubljana, Vodnikova, Ljubljana, Slovenia