1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
2. Department of Radiology, Namwon Medical Center, 365, Chungjeong-ro, Namwon-si, Jeollabuk-do 590-702, Republic of Korea