1. From the Department of Neurology, National Medical Center, Seoul, Republic of Korea (J.-H.B.)
2. Department of Neurology (J.-H.B., J.H.H., H.S.N., Y.D.K.), Severance Stroke Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
3. Division of Interventional Neuroradiology, Department of Radiology (B.M.K., D.J.K.), Severance Stroke Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.