1. First Department of Internal Medicine, Sismanogleio General Hospital, Sismanogliou 1 Str., 15126 Athens, Greece
2. Department of Internal Medicine, Hippokration General Hospital, 114 Vassilissis Sofias Str., 11527 Athens, Greece
3. Department of Microbiology, “KAT” General Hospital of Attica, 14561 Athens, Greece
4. Second Department of Critical Care, Attikon University Hospital, 1 Rimini Str., 12462 Athens, Greece
5. Department of Biological Chemistry, National and Kapodistrian University of Athens, 75 Mikras Asias Str., 11527 Athens, Greece