1 Department of Pediatric Oncology, Erasmus MC-Sophia Children's Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands.
2 Department of Immunology, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
3 Center for Applied Proteomics and Molecular Medicine, George Mason University, Manassas, VA, USA.
4 Department of Clinical Genetics, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands.
5 COALL Study Group, Research Institute Children's Cancer Center and Clinic of Pediatric Oncology, University Medical Center Eppendorf, Hamburg, Germany.
6 1] Department of Pediatric Oncology, Erasmus MC-Sophia Children's Hospital, University Medical Center Rotterdam, Rotterdam, The Netherlands [2] Dutch Childhood Oncology Group, The Hague, The Netherlands.