1. Department of Radiology, The First People's Hospital of Foshan, Foshan, Guangdong 528000, P.R. China
2. Clinical Research Institute, The First People's Hospital of Foshan, Foshan, Guangdong 528000, P.R. China
3. Department of Internal Medicine, The Fifth People's Hospital of Nanhai District of Foshan, Foshan, Guangdong 528231, P.R. China