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Article History

Received: 29 December 2017

Accepted: 10 May 2018

First Online: 24 May 2018

Authors’ information

: CXC, ZMC, GYL, SYL and YQY are residents and master graduate students at the Arthritis Clinic and Research Center of Peking University People’s Hospital, they are clinically and scientifically mainly focused on diagnosis and treatment of arthritis. TZS is the chief physician, professor and the doctoral supervisor of Arthritis Clinic and Research Center of Peking University People’s Hospital, and he is also the head of this research group.

: Not applicable.

: The authors obtained the written consent from both patients themselves for the publication of the data and images that appear in the article. A copy of the written consent is available for review by the Editor-in-chief of this journal.

: The authors declare that they have no competing interests.

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