1. Department of Microbiology, Laikon General Hospital, 11527 Athens, Greece
2. Department of Microbiology, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. First Department of Propaedeutic Internal Medicine, Medical School, National and Kapodistrian University of Athens, Laikon General Hospital, 11527 Athens, Greece
4. Intensive Care Unit, Laikon General Hospital, 11527 Athens, Greece