2.1. Literature collection strategy
The databases Pubmed, Cochrane, Embase, Web of Science, CNKI, WanFangData, and Cqvip were all thoroughly searched. Without regard to language or location, the search was carried out from the beginning through January 2023. The search was conducted using the terms ”Sjögren’s Syndrome,” ”TNFSF13B,” and ”BAFF” along with associated nouns. To find other studies that were not indexed by our initial search, the bibliographies of other pertinent research were also searched. Articles in the full text were retrieved from Shandong University’s library. The author was contacted if the library did not have access to the complete text.