1. Department of Radiology, Tongji Hospital, Tongji University School of Medicine, Shanghai 200065, PR China
2. Institute of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, PR China
3. Department of Radiology, Shanghai Liqun Hospital, Shanghai 200333, PR China
4. Department of Radiology, The Fifth People's Hospital of Shanghai, Fudan University, Shanghai 200240, PR China
5. Department of Radiology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai 200120, PR China
6. Department of Geriatrics, The Sixth People's Hospital of Shanghai, Shanghai Jiao Tong University, Shanghai 200233, PR China