[1] Univ Crete, Sch Med, Dept Hematol, Iraklion, Greece
[2] Univ Athens, Dept Hematol, Laikon Gen Hosp, Athens 11528, Greece
[3] Athens Med Ctr, Athens, Greece
[4] Univ Athens, Sch Med, Dept Propedeut & Internal Med 1, GR-11527 Athens, Greece
[5] Laikon Gen Hosp, Thalassemia Ctr, Athens, Greece
[6] Univ Athens, Dept Internal Med 1, Hematol Unit, Laikon Gen Hosp, Athens 11528, Greece