1. Department of Clinical Therapeutics,
2. Second Department of Internal Medicine, and
3. Second Department of Internal Medicine, Propaedeutic, ''ATTIKON'' General University Hospital, National and Kapodistrian University of Athens School of Medicine, Athens, Greece;
4. Department of Haematology, Evangelismos Hospital, Athens, Greece; and
5. Haematology Laboratory and
6. Immunology Laboratory, Alexandra Hospital, Athens, Greece