1. Department of Haematology, Laikon General Hospital, National and Kapodistrian University of Athens, Athens, Greece;
2. Department of Pathology, Laikon General Hospital, National and Kapodistrian University of Athens, Athens, Greece;
3. Dr Senckenberg Institute of Pathology, Goethe University Hospital Frankfurt, Frankfurt, Germany;
4. Department of Haematology, Athens Medical Center, Psychikon, Athens, Greece