[1] Greek Myeloma Study Grp, Athens, Greece
[2] Theagenio Canc Hosp, Thessaloniki, Greece
[3] Univ Athens, Sch Med, Athens 11528, Greece
[4] Evangelismos Med Ctr, Athens, Greece
[5] Univ Patras, Sch Med, GR-26110 Patras, Greece
[6] Metaxa Canc Hosp, Piraeus, Greece
[7] G Gennimatas Gen Hosp, Athens, Greece
[8] George Papanicolaou Hosp, Thessaloniki, Greece
[9] St Savvas Oncol Hosp, Athens, Greece