1. Department of Hematology, Cancer Research Center Groningen, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
2. Department of Laboratory Medicine, Laboratory of Hematology, Radboud University Medical Center, Nijmegen, The Netherlands;
3. Department of Pathology and Tumor Biology, Kyoto University, Kyoto, Japan;
4. Human Genome Center, Institute of Medical Science, the University of Tokyo, Tokyo, Japan; and
5. Department of Genetics, University Medical Center Groningen, University of Groningen, The Netherlands