1. Fourth Department of Internal Medicine and
2. Third Department of Internal Medicine, National and Kapodistrian University of Athens, Medical School, Athens, Greece
3. First Department of Internal Medicine, G. Gennimatas General Hospital of Athens, Athens, Greece
4. Second Department of Internal Medicine, Tzaneio General Hospital of Piraeus, Athens, Greece
5. First Department of Internal Medicine and
6. Second Department of Internal Medicine, Thriasio General Hospital of Eleusis, Athens, Greece; and
7. Second Department of Internal Medicine, Sismanogleio General Hospital of Athens, Athens, Greece