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, Hallym University College of Medicine, Hallym University Dongtan Sacred Heart Hospital, Hwaseong 18450, Korea.
3. Department of Radiology and Biomedical Engineering, School of Medicine, Kyungpook National University, Daegu 41944, Korea.