1. Department of Radiology and Center for Imaging ScienceSamsung Medical Center, Sungkyunkwan University School of Medicine Seoul Korea
2. Department of RadiologySoonchunhyang University College of Medicine, Cheonan Hospital Cheonan‐si Chungcheongnam‐do Korea
3. Department of RadiologySoonchunhyang University College of Medicine, Bucheon Hospital Bucheon Korea
4. Clinical Trial CenterSoonchunhyang University Cheonan Hospital Cheonan‐si Chungcheongnam‐do Korea