1. Department of Paediatrics, University Hospital of Patras, Patras, Greece;
2. Department of Emergency Medicine, University Hospital of Patras, Patras, Greece;
3. Department of Internal Medicine, University Hospital of Patras, Patras, Greece;
4. Department of Microbiology, University Hospital of Patras, Patras, Greece;
5. Department of Internal Medicine, Division of Infectious Diseases, University Hospital of Patras, Patras, Greece