1. Department of Radiology, Soonchunhyang University College of Medicine, Cheonan Hospital, Cheonan, Korea.
2. Vascular Center, The Eutteum Orthopedic Surgery Hospital, Paju, Korea.
3. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Department of Radiology, Korea University College of Medicine, Korea University Ansan Hospital, Ansan, Korea.
5. Department of Radiology, University of Ulsan College of Medicine, Gangneung Asan Hospital, Gangneung, Korea.