1. Department of Neurosurgery, Catholic Kwandong University College of Medicine, International St. Mary’s Hospital, Incheon, Korea
2. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
3. Department of Radiology, Yonsei University College of Medicine, Seoul, Korea
4. Department of Radiology, College of Medicine, Ehwa Woman’s University, Ewha Womans University Seoul Hospital, Seoul, Korea
5. Department of Radiology, Ajou University Hospital, Ajou University College of Medicine, Suwon, Korea
6. Department of Neurosurgery, College of Medicine, Ewha Womans University, Ewha Womans University Seoul Hospital, Seoul, Korea
7. Department of Radiology, Gangnam Severance Hospital,Yonsei University College of Medicine, Seoul, Korea