1. Department of Physiology and Pathophysiology, Medical University, 1413 Sofia, Bulgaria
2. Genetic Medico‑Diagnostic Laboratory Genica, 1612 Sofia, Bulgaria
3. University Hospital for Respiratory Diseases St. Sophia, 1413 Sofia, Bulgaria
4. Laboratory of Clinical Virology, Medical School, University of Crete, Heraklion 71003, Greece
5. Biomedical Applications Unit, Institute Of Chemical Biology, National Hellenic Research Foundation, 11635 Athens, Greece