1. Department of Radiology, Guangdong General Hospital/Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, P.R. China
2. Graduate College, Southern Medical University, Guangzhou, Guangdong, P.R. China
3. Department of Radiology, Huizhou Municipal Central Hospital, Huizhou, Guangdong, P.R. China
4. School of medicine, South China University of Technology, Guangzhou, Guangdong, P.R. China