1. Department of Pulmonology, Laiko General Hospital, 11527 Athens, Greece
2. Department Oncology, Athens Medical Group, 15125 Athens, Greece
3. First Department of Propedeutic Internal Medicine, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. First Department of Internal Medicine, Laiko General Hospital, 11527 Athens, Greece
5. Renal Transplantation Unit, Laiko General Hospital, 11527 Athens, Greece
6. Department of Pathology, Sismanogleio Hospital, 15126 Athens, Greece
7. First Department of Pulmonology, Sismanogleio Hospital, 15126 Athens, Greece
8. Department of Thoracic Surgery, Agios Savvas Hospital, 11522 Athens, Greece
9. Department of Cytology, Mitera Hospital, 15123 Athens, Greece
10. Department of Biochemistry, Sismanogleio Hospital, 15126 Athens, Greece
11. Laboratory of Clinical Virology, School of Medicine, University of Crete, 71003 Heraklion, Greece