1. School of Medicine, University of Patras, 26504 Patras, Greece
2. Department of Microbiology, University General Hospital of Patras, 26504 Patras, Greece
3. Departments of Internal Medicine and Infectious Diseases, University General Hospital of Thessaloniki “AHEPA”, 54636 Thessaloniki, Greece
4. 4th Department of Internal Medicine, Medical School, National and Kapodistrian University of Athens, Attikon University General Hospital, 12462 Athens, Greece
5. Departments of Internal Medicine and Infectious Diseases, Democritus University of Thrace, 68100 Alexandroupolis, Greece
6. Departments of Internal Medicine and Infectious Diseases, University General Hospital of Heraklion, 71500 Heraklion, Greece
7. Departments of Internal Medicine and Infectious Diseases, University General Hospital of Patras, 26504 Patras, Greece