1. Department of Medicine, University of Patras, 26504 Patras, Greece
2. Department of Internal Medicine and Infectious Diseases, University General Hospital of Patras, 26504 Patras, Greece
3. Department of Infectious Diseases, German Oncology Center, 4108 Limassol, Cyprus
4. 3rd Department of Critical Care, Evgenidio Hospital, Medical School, National and Kapodistrian University of Athens, 11528 Athens, Greece