1. Fourth Department of Internal Medicine, University General Hospital Attikon, National and Kapodistrian University of Athens, 12462 Athens, Greece
2. Department of Infectious Diseases, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge CB2 0QQ, UK
3. 1st Department of Internal Medicine-Infectious Diseases, Hygeia General Hospital, 4 Erythrou Stavrou & Kifisias, Marousi, 15123 Athens, Greece
4. Third Department of Pediatrics, University General Hospital Attikon, National and Kapodistrian University of Athens, 12462 Athens, Greece