1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
2. Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing 210029, China.
3. Department of Radiology, Catholic Kwandong University International St. Mary's Hospital, Catholic Kwandong University College of Medicine, Incheon 22711, Korea.
4. Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan 47392, Korea.