1. Department of Rheumatology; The Chenzhou First People's Hospital; Changsha China
2. Department of UItrasonic Diagnosis; The Second Xiangya Hospital of Central South University; HuNan China
3. Department of Radiology; The Second Xiangya Hospital of Central South University; HuNan China
4. Department of Rheumatology; The Second Xiangya Hospital of Central South University; HuNan China