Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Radiology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Peking University - Shenzhen Hospital, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Quanzhou Orthopedics-Traumatological Hospital - Department of Ankylosing Spondylitis, Fujian Medical University - Zhangzhou Affiliated Hospital, Hong Kong University of Science & Technology (HKUST) - Medical Center, Fujian Medical University - Fujian Medical University Union Hospital, Fujian Medical University - Department of Rheumatology and Clinical Immunology, Fujian Medical University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Epidemiology Research Unit and Xiamen University - Department of Rheumatology and Clinical Immunology

affiliation not provided to SSRN, Xiamen University - School of Medicine, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University, Xiamen University, Xiamen University - Department of Rheumatology and Clinical Immunology, Xiamen University, Xiamen University, Xiamen University, Xiamen University - Epidemiology Research Unit, Xiamen University - Department of Rheumatology and Clinical Immunology and Xiamen University - Department of Rheumatology and Clinical Immunology