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Mitsuo TSURU
Dept. of Neurosurgery, Hokkaido University School of Medicine
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Haruo TAKAMURA
Dept. of Neurosurgery, Hokkaido University School of Medicine
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Kenzo YADA
Dept. of Neurosurgery, Hokkaido University School of Medicine
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Hiroshi ABE
Dept. of Neurosurgery, Hokkaido University School of Medicine