Pei-Lun Kuo1, Yun-Ju Wu2, Fu-Zong Wu3. 1. Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Faculty of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan. 2. Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan. 3. Department of Radiology, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan; Faculty of Clinical Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Institute of Education, National Sun Yat-sen University, 70, Lien-Hai Road, Kaohsiung 80424, Taiwan. Electronic address: cmvwu1029@gmail.com.