1 Department of Radiology, College of Medicine, The Catholic University of Korea, Seoul, South Korea.
2 Department of Neurology, College of Medicine, The Catholic University of Korea, Incheon, South Korea.
3 Department of Radiology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, 665 Bupyeong-dong, Bupyeong-gu, Incheon, South Korea 403-720.
4 Department of Clinicopathology, College of Medicine, The Catholic University of Korea, Incheon, South Korea.