1. Department of Neurology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Radiology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Neurosurgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Neurosurgery, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Severance Institute for Vascular and Metabolic Research, Seoul, Korea.