1. Department of Radiology, Chonnam National University Medical School, Chonnam National University Hwasun Hospital, Hwasun, Republic of Korea.
2. Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
3. Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Republic of Korea.
4. Department of Radiology, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea.
5. Department of Radiology, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Republic of Korea.
6. Department of Preventive Medicine, Chonnam National University Medical School, Chonnam National University Hospital Cardio-Cerebrovascular Center, Gwangju, Republic of Korea.