1. Department of Infectious Diseases, Laiko General Hospital, 11527 Athens, Greece
2. Renal Transplantation Unit, Laiko General Hospital, 11527 Athens, Greece
3. Unit of Endocrinology, First Department of Internal Medicine, Laiko General Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. Department of Pathology, Sismanogleio Hospital, 15126 Athens, Greece
5. Department of Radiology, Laiko General Hospital, 11527 Athens, Greece
6. Department of Thoracic Surgery, Agios Savvas Hospital, 11522 Athens, Greece
7. Department of Cytology, Mitera Hospital, 15123 Athens, Greece
8. Department of Biochemistry, Sismanogleio Hospital, 15126 Athens, Greece
9. Laboratory of Clinical Virology, School of Medicine, University of Crete, 71003 Heraklion, Greece