Department of Neurosurgery (M.K., J.B., W.P., J.C.P., J.S.A., S.L.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea. Department of Neurosurgery, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea (Y.C.). Department of Neurosurgery, Seoul National University Bundang Hospital, Republic of Korea (S.U.L.). Department of Radiology (J.E.P.), Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.