[1] Oslo Univ Hosp, Oslo Myeloma Ctr, Oslo, Norway
[2] Univ Oslo, Inst Clin Med, Oslo, Norway
[3] Stavanger Univ Hosp, Dept Hematol & Oncol, Stavanger, Norway
[4] St Olavs Univ Hosp, Dept Hematol, Trondheim, Norway
[5] Aarhus Univ Hosp, Dept Hematol, Aarhus, Denmark
[6] Oslo Univ Hosp, OSlo Myeloma Ctr, Dept Hematol, Oslo, Norway
[7] Copenhagen Univ Hosp, Rigshosp, Dept Hematol, Copenhagen, Denmark