1. Department of Internal Medicine, University of Crete School of Medicine, Heraklion, Greece;
2. Alfa Institute of Biomedical Sciences (AIBS), Athens, Greece;
3. Department of Internal Medicine, Henry Dunant Hospital Center, Athens, Greece;
4. Department of Clinical Microbiology, University Hospital of Heraklion, Heraklion, Crete, Greece;
5. Department of Applied Mathematics and Physics, National Technical University of Athens, Athens, Greece;
6. University of Crete School of Medicine, Heraklion, Crete, Greece;
7. Department of Medicine, Tufts University School of Medicine, Boston, MA, USA