Affiliation: | 1. Department of Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic-ro-43-gil, Songpa-gu, Seoul, 138-736, Republic of Korea 2. Radiosurgery Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea 3. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea
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