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.