1. Department of Radiology, Guangdong General Hospital affiliated to South China University of Technology, Guangzhou, Guangdong, PR China
2. Department of Radiology, Guizhou Medical University Affiliated Hospital, Guizhou, PR China
3. Medical Imaging Center, the First Affiliated Hospital, Jinan University, Guangzhou, Guangdong, PR China
4. Philips Healthcare, PR China