1 Department of Radiology, Hospital of Chengdu University of Traditional Chinese Medicine. No. 39 Shi-er-qiao Road, Sichuan Province, P.R. China.
2 Department of Ultrasound, Chengdu, Hospital of Chengdu University of Traditional Chinese Medicine. No. 39 Shi-er-qiao Road, Chengdu, Sichuan Province, P.R. China.