1. Division of Neurosurgery, Department of Neurological Surgery, Nihon University School of Medicine, Tokyo 173-8610, Japan
2. Division of Anatomical Science, Department of Functional Morphology, Nihon University School of Medicine, Tokyo 173-8610, Japan
3. Department of Computational Biology and Medical Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Tokyo 277-8562, Japan
4. Japan Agency for Medical Research and Development, Tokyo 100-0004, Japan
5. Division of Companion Diagnostics, Department of Pathology and Microbiology, Nihon University of School of Medicine, Tokyo 173-8610, Japan