1. Department of Ultrasonography, Jinan Infectious Disease Hospital, Jinan, Shandong 250021, P.R. China
2. Department of Ultrasonography, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong 250014, P.R. China
3. Department of Oncology, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong 250014, P.R. China
4. The Medical Research Center, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong 250014, P.R. China