1. Department of Infectious Diseases and COVID‑19 Unit, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
2. Department of Pathophysiology, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. ENT Department, Laiko General Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. Unit of Endocrinology, First Department of Propedeutic and Internal Medicine, Laiko General Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece
5. Laboratory of Clinical Virology, Medical School, University of Crete, 71003 Heraklion, Greece