1. Department of Infectious Diseases‑COVID‑19 Unit, Laiko General Hospital, 11527 Athens, Greece
2. First Department of Internal Medicine, Laiko General Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
3. Pulmonology Department, Laiko General Hospital, 11527 Athens, Greece
4. Laboratory of Clinical Virology, Medical School, University of Crete, 71003 Heraklion, Greece
5. Unit of Endocrinology, First Department of Propedeutic and Internal Medicine, Laiko General Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece
6. Laboratory of Hematology, Laiko General Hospital, 11527 Athens, Greece
7. National Actuarial Authority, 10559 Athens, Greece
8. Department of Cytology, Mitera Hospital, 15123 Athens, Greece
9. Department of Biochemistry, Sismanogleio Hospital, 15126 Athens, Greece