[1] Aarhus Univ Hosp, Dept Paediat & Adolescent Med, Aarhus, Denmark
[2] Uppsala Univ, Dept Pharm, Uppsala, Sweden
[3] Oslo Univ Hosp, Dept Pediat Hematol Oncol, Oslo, Norway
[4] Tallins Childrens Hosp, Dept Haematol & Oncol, Tallinn, Estonia
[5] Vilnius Univ Hosp Santaros Klin, Ctr Pediat Oncol & Hematol, Vilnius, Lithuania
[6] Kuopio Univ Hosp, Dept Haematol & Oncol, Kuopio, Finland
[7] Kuopio Univ Hosp, Dept Haematol, Kuopio, Denmark
[8] Rigshosp, Copenhagen Univ Hosp, Dept Paediat & Adolescent Med, Copenhagen, Denmark
[9] Vilnius Univ Hosp, Santaros Klin, Vilnius, Denmark
[10] Natl Univ Hosp Iceland, Dept Pediat Hematol Oncol, Reykjavik, Iceland
[11] St Olavs Univ Hosp, Dept Haematol, Trondheim, Norway
[12] Rigshosp, Dept Hematol, Copenhagen Univ Hosp, Copenhagen, Denmark