1. Department of Radiology; Pusan National University Hospital; Pusan National University School of Medicine; Busan Republic of Korea
2. Department of Radiology; Yonsei University College of Medicine, Severance Hospital; Seoul Republic of Korea
3. Department of Radiology; Seoul St. Mary's Hospital; The Catholic University of Korea College of Medicine; Seoul Republic of Korea
4. Department of Radiology Neurosurgery; Yonsei University College of Medicine, Severance Hospital; Seoul Republic of Korea