Affiliation: | 1. Department of Neurosurgery, Itsukaichi Memorial Hospital, 1-95 Kurashige, Saeki-ku, Hiroshima, 731-5156, Japan 2. Department of Neurosurgery, Graduate School of Biomedical and Health Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, 734-8551, Japan
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