Shan-Ming Chen1, Teng-Fu Tsao2, Hsiang-Lin Lee3. 1. Department of Pediatrics, Chung Shan Medical University Hospital, Taichung, Taiwan; Department of Pediatrics, School of Medicine, Chung Shan Medical University, Taichung, Taiwan. 2. Department of Medical Imaging, Chung Shan Medical University Hospital, Taichung, Taiwan; Department of Medical Imaging, School of Medicine, Chung Shan Medical University, Taichung, Taiwan. 3. Department of Surgery, Chung Shan Medical University Hospital, Taichung, Taiwan; Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan.