[1] Karolinska Inst, Dept Oncol Pathol, Stockholm, Sweden
[2] Karolinska Inst, Dept Pathol Oncol, Stockholm, Sweden
[3] Univ Crete, Med Sch, Dept Pathol, Iraklion, Greece
[4] Natl & Kapodistrian Univ Athens, Laikon Gen Hosp, Dept Hematol & Bone Marrow Transplantat, Athens, Greece