1. Department of Surgery, National Defense Medical College, Tokorozawa, Japan
2. Department of Laboratory Medicine, National Defense Medical College, Tokorozawa, Japan
3. Department of Basic Pathology, National Defense Medical College, Tokorozawa, Japan
4. Laboratory for Mathematics, National Defense Medical College, Tokorozawa, Japan
5. Laboratory for Statistical Analysis, Center for Genomic Medicine, RIKEN, Wako, Japan