Affiliation: | 1. Department of Pharmacology, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan 3. Asahi General Hospital, Asahi I-1326, Chiba, 289-2251, Japan 2. Department of Neurosurgery, Sapporo Medical University School of Medicine, South-1, West-17, Chuo-ku, Sapporo, 060-8556, Japan
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