1. Division of Infectious Diseases, School of Medicine, University of Patras, 26504, Rion, Patras, Greece
2. Present address: Department of Internal Medicine, Hôpital du Jura, Fbg des Capucins 30, CH2800 Delémon, Switzerland.
3. Division of Anaesthesiology and Intensive Care Medicine, School of Medicine, University of Patras, 26504, Rion, Patras, Greece
4. Department of Microbiology, School of Medicine, University of Patras, 26504, Rion, Patras, Greece