1 Hematology Section of First Department of Propaedeutic Internal Medicine, University of Athens Medical School, Laikon General Hospital of Athens, Athens, Greece.
2 The Japanese Society of Myeloma, Hematology Section of Internal Medicine, Tokai Chuo Hospital, Kakamigahara, Japan.
3 Department of Haematology, Athens Medical Center, Psychikon Branch, Athens, Greece.