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.