Affiliation: | 1. Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, 110-744, Seoul, South Korea 2. Department of Neurosurgery, Seoul National University Hospital, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, South Korea 3. Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea 4. Department of Anesthesiology and Pain Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, South Korea
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