1. 1Department of Internal Medicine, University of Patras Medical School, Rion, Greece
2. 2Department of Pediatrics, National and Kapodistrian University of Athens Medical School, Athens, Greece
3. 3First Department of Internal Medicine, National and Kapodistrian University of Athens Medical School, Athens, Greece
4. 4Department of Hematology, University of Thessaly Medical School, Larissa, Greece
5. 5Department of Biology, National and Kapodistrian University of Athens, Athens, Greece
6. 6Department of Hematology, Gennimatas General Hospital, Athens, Greece