Affiliation: | (1) Department of Neurology, Seoul National University College of Medicine, Seoul National University Hospital, 28 Yonkeun dong, Chongno ku, Seoul, 110-744, Korea;(2) Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University Hospital, 28 Yonkeun dong, Chongno ku, Seoul, 110-744, Korea;(3) Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, 28 Yonkeun dong, Chongno ku, Seoul, 110-744, Korea |