The authors declare that they have no conflicts of interest.
Ethical approval
The study was conducted in accordance with the Declaration of Helsinki, and approved by Ethics Committee of V.A. Nasonova Research Institute of Rheumatology (Protocol No. 25 dated December 19, 2019).
Consent to participate
Informed consent to participate in the study was obtained from all participants.
Consent to publication
Informed consent to publication was obtained from relevant participants.
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