1. Department of Radiology, Chung-Ang University Hospital, Seoul, Korea.
2. Department of Radiology, Korea University Ansan Hospital, Ansan, Korea.
3. Department of Radiology, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
4. Department of Radiology and Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Radiology and Research Institute of Radiological Science, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Pathology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.