1. Department of Radiology, Ezhou Central Hospital, Ezhou, Hubei 436000, P.R. China
2. Medical Imaging Center, Dongfeng Hospital of Hubei Medical College, Shiyan, Hubei 442008, P.R. China
3. Department of Radiology, Central Hospital of Huanggang, Huanggang, Hubei 438000, P.R. China