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aDepartment of Rheumatology and Immunology, The Second Affiliated Hospital of Soochow University, Suzhou, 215004, China bDepartment of Nephrology, The Affiliated Suzhou Hospital of Nanjing Medical University, Suzhou Municipal Hospital, Suzhou, 215002, China GANG WANG (Orcid ID: 0000-0002-8836-1593) Article type: Letter to the editor Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Published online ■ ■ *Corresponding author. Address: Department of Rheumatology and Immunology, The Second Affiliated Hospital of Soochow University, Suzhou, China, Tel：86-51267784169. E-mail address: [email protected] (Z. Liu). This is an open access article distributed under the Creative Commons Attribution-ShareAlike License 4.0, which allows others to remix, tweak, and build upon the work, even for commercial purposes, as long as the author is credited and the new creations are licensed under the identical terms. http://creativecommons.org/licenses/by-sa/4.0/