1. From the Interventional Neuroradiology, Severance Stroke Center, Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea (B.M.K., D.J.K.)
2. Department of Neurology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, South Korea (J.-H.B.)
3. Department of Neurology, Severance Hospital Stroke Center, Yonsei University College of Medicine, Seoul, South Korea (J.H.H., H.S.N., Y.D.K.).