1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea
2. Department of Radiology, GangNeung Asan Hospital, Gangneung-si Gangwon-do, Republic of Korea
3. Department of Radiology, Human Medical Imaging and Intervention Center, Seocho-gu Seoul, Republic of Korea