1 Department of Radiology, Buddhist Tzuchi General Hospital Taipei Branch, No. 289, Jianguo Road, Xindian District, New Taipei City 23142, Taiwan.
2 Department of Radiology (J.-W.K.), Department of Orthopaedics (C.-J.C., G.R., C.-Y.C., C.-H.C.), Shuang-Ho Hospital, Taipei Medical University, Taipei, No. 291, Zhongzheng Road, Zhonghe District, New Taipei City 23561, Taiwan. chiaxian@gmail.com.