Affiliation: | 1. Department of Neurosurgery, Seoul National University Bundang Hospital, 82, Gumi-ro 173 Beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-707, Republic of Korea 2. Department of Neurosurgery, Seoul National University Hospital, 101 Daehak-Ro, Jongno-Gu, Seoul, 110-744, Republic of Korea
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