1. Department of Ultrasonography, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215002, P.R. China
2. Department of Ultrasonography, Jiangyin People's Hospital, Wuxi, Jiangsu 214400, P.R. China
3. Pharmacy Department, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou, Jiangsu 215002, P.R. China
4. Department of Ultrasonography, Wuxi People's Hospital, Wuxi, Jiangsu 214000, P.R. China