○Hiroki Niwa1,2, Toru Nakamura1, Hiroki Kushiya1, Tomohiro Suzuki1, Kazuho Inoko1, Kei Hiraoka1,2, Akihito Inagaki3, Takahiro Tsuchikawa1, Toshiaki Shichinohe1, Noriyuki Kasahara3,4, Satoshi Hirano1
(1.Department of Gastroenterological Surgery II, Hokkaido University Graduate School of Medicine, 2.Department of Clinical Research, National Hospital Organization (NHO) Hakodate National Hospital, 3.Departments of Neurological Surgery, University of California, San Francisco (UCSF), 4.Departments of Radiation Oncology, University of California, San Francisco (UCSF))
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