1. Department of Clinical Microbiology, University Hospital of Heraklion, Heraklion, Crete, Greece.
2. Alfa Institute of Biomedical Sciences (AIBS), Athens, Greece.
3. Department of Internal Medicine, University Hospital of Heraklion, Heraklion, Crete, Greece.
4. Department of Medicine, Henry Dunant Hospital, Athens, Greece.
5. Department of Medicine, Tufts University School of Medicine, Boston, Massachusetts.