1. Department of Radiology, The Third People's Hospital of Nantong, Nantong, Jiangsu 226006, P.R. China
2. Department of Radiology, Zhuhai Hospital of Jinan University, Zhuhai People's Hospital, Zhuhai, Guangdong 519000, P.R. China
3. Department of Radiology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510000, P.R. China