1. Department of Pathophysiology, Laiko General Hospital, Medical School of National and Kapodistrian University of Athens, 11527 Athens, Greece
2. First Department of Respiratory Medicine, Sismanogleio Hospital, 15126 Athens, Greece
3. Department of Biochemistry, Sismanogleio Hospital, 15126 Athens, Greece
4. Laboratory of Clinical Virology, School of Medicine, University of Crete, 71003 Heraklion, Greece