1. Department of Ultrasound, The Fourth Affiliated Hospital, College of Medicine; Zhejiang University; Yiwu China
2. Department of Ultrasound; Zhejiang Provincial People's Hospital, and Affiliated People's Hospital of Hangzhou Medical College; Hangzhou China
3. Community Health Centre in Binjiang District; Hangzhou China
4. Department of Neurology; Zhejiang Provincial People's Hospital; Hangzhou China