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Hidehiko TAKAMATSU
Department of Neurological Surgery, Sapporo Medical College and Hospital
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Ikuro TAKADA
Department of Neurological Surgery, Sapporo Medical College and Hospital
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Ryoji HAGIWARA
Department of Neurological Surgery, Sapporo Medical College and Hospital
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Katsumi SUEMATSU
Department of Neurological Surgery, Sapporo Medical College and Hospital
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Vernon H. MARK
Department of Neurosurgery, Boston City Hospital, Harvard University
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Hiroshi TSUTSUMI
Department of Neurosurgery, Boston City Hospital, Harvard University