1. Clinical Laboratory , Keio University Hospital , Tokyo , Japan
2. Department of Laboratory Medicine , Keio University School of Medicine , Tokyo , Japan
3. Department of Diagnostic Pathology , Keio University School of Medicine , Tokyo , Japan
4. Division of Hematology, Department of Medicine , Keio University School of Medicine , Tokyo , Japan
5. Department of Hematology , Japanese Red Cross Medical Center , Tokyo , Japan
6. Division of Molecular Oncology , National Cancer Center Research Institute , Tokyo , Japan