[1] Univ Lund Hosp, Dept Clin Genet, SE-22185 Lund, Sweden
[2] Karolinska Inst, Astrid Lindgrens Childrens Hosp, Childhood Canc Res Unit, Stockholm, Sweden
[3] Univ Lund Hosp, Dept Pathol, SE-22185 Lund, Sweden
[4] Univ Lund Hosp, Dept Pediat Oncol & Hematol, SE-22185 Lund, Sweden
[5] Univ Amsterdam, Acad Med Ctr, Dept Pathol, NL-1105 AZ Amsterdam, Netherlands