1. Department of Physiology and Pathophysiology, Medical University Sofia, 1431 Sofia, Bulgaria
2. Genetic Medico‑Diagnostic Laboratory ‘Genica’, 1612 Sofia, Bulgaria
3. Laboratory of Clinical Virology, Medical School, University of Crete, 71003 Heraklion, Greece
4. Biomedical Applications Unit, Institute of Chemical Biology, National Hellenic Research Foundation, 11635 Athens, Greece