1. Department of Radiology and Institute of Rehabilitation and Imaging of Brain Function, Nanchong Central Hospital, North Sichuan Medical College, Nanchong
2. Department of Radiology, Xuanwu Hospital, Capital Medical University
3. National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, Chengdu
4. Department of Radiology, Hospital of Traditional Chinese Medicine of Leshan, Leshan, China
5. Department of Radiology, Peking University Third Hospital, Beijing