The Second Clinical Medical School, Zhujiang Hospital, Southern Medical University, Guangzhou, China

Zhounan Zhou MBBS & Qiyu Xie MBBS

Clinical Research Centre, Zhujiang Hospital, Southern Medical University, Guangzhou, 510280, China

Haowei Chen PhD, Muhui Zeng PhD & Zhaohua Zhu MD, PhD

Department of Orthopedics, General Hospital of Southern Theatre Command of PLA, Guangzhou, China

Muhui Zeng PhD

Department of Rheumatology, Royal North Shore Hospital and Kolling Institute, University of Sydney, Sydney, Australia

Zhaohua Zhu MD, PhD

Dr. Zhu and Zhou had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Concept and design: Z. Zhou, Z. Zhu. Acquisition, analysis, or interpretation of data: All authors. Drafting of the manuscript: Z. Zhou, Z. Zhu. Critical revision of the manuscript for important intellectual content: All authors. Statistical analysis: Z. Zhou, H. Chen, Z. Zhu. Supervision: Z. Zhu.

Correspondence to Zhaohua Zhu MD, PhD.