1. Department of Hepatology, Hangzhou Xixi Hospital, Hangzhou, Zhejiang 310006, P.R. China
2. Department of Ultrasonography, Hangzhou Xixi Hospital, Hangzhou, Zhejiang 310006, P.R. China
3. Department of Emergency, Hangzhou Xixi Hospital, Hangzhou, Zhejiang 310006, P.R. China
4. Department of Ultrasonography, Hangzhou Red Cross Hospital, Hangzhou, Zhejiang 310003, P.R. China