1. Second Department of Internal Medicine, University of Athens Medical School, Hippocration Hospital, 114 Vassilissis Sophias Avenue, GR-11527, Athens, Greece
2. First Department of Internal Medicine, Laikon General Hospital, Athens, Greece
3. Department of Dermatology and Venereology, A Syngros Hospital, University of Athens Medical School, Athens, Greece
4. Second Department of Internal Medicine, Hippocration General Hospital, Athens, Greece