1. Departments of Neurosurgery and Neuro-Oncology, National Cancer Center Hospital, Tsukiji, Chuo-ku, Japan.
2. Departments of Gastrointestinal Medical Oncology, National Cancer Center Hospital, Tsukiji, Chuo-ku, Japan.
3. Departments of Diagnostic Pathology, National Cancer Center Hospital, Tsukiji, Chuo-ku, Japan.
4. Department of Surgery, Denenchofu Central Hospital, Denentyoufu, Ota-ku, Tokyo, Japan.