1. 2nd Department of Internal Medicine, General Hospital of Kavala, 65500 Kavala, Greece
2. 2nd Department of Pediatrics, AHEPA University Hospital, Aristotle University of Thessaloniki, 54636 Thessaloniki, Greece
3. Hematology Department, G. Papanikolaou Hospital, Aristotle University of Thessaloniki, 57010 Thessaloniki, Greece