1. 1st Internal Medicine Clinic, Medical School, Laiko University Hospital of Athens, 115 27 Athens, Greece
2. Biomedical Applications Unit, Institute of Chemical Biology, National Hellenic Research Foundation (NHRF), 116 35 Athens, Greece
3. Laboratory of Clinical Virology, University of Crete, 71003 Heraklion, Greece
4. Oncology Unit, Medical School, University of Crete, 71003 Heraklion, Greece