1 Department of Neurology, School of Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University, Seoul, South Korea.
2 Department of Radiology, Interventional Neuroradiology, Severance Stroke Center, Severance Hospital, College of Medicine, Yonsei University, Seoul, South Korea.
3 Department of Imaging and Interventional Radiology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong.
4 Department of Neurology, School of Medicine, Samsung Medical Center, Sungkyunkwan University, Seoul, South Korea.