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- Published online August 1, 2021.
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© 2021 The Journal of Rheumatology
Author Information
- Nan Chen and
- Yi Zheng
-
N Chen, MD, Department of Rheumatology and Immunology, Beijing Tongren Hospital, Capital Medical University, Beijing 100730, China; Y Zheng, MD, Department of Rheumatology and Immunology, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China.
Funding: This study did not receive funding.
Conflict of interest: None declared.
Statement of ethics and consent: An Institutional Review Board at Beijing Tongren hospital approved the study (approval number, TRECKY2020-166). Patients' written informed consent was waived due to the retrospective nature of the study.
Corresponding author: Yi Zheng, MD Department of Rheumatology and Immunology, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China. Email: zzyy90@sina.com