Yu L, Shao M, Zhou T, Xie H, Wang F, Kong J, Xu S, Shuai Z, Pan F. Association of CTLA-4 (+49 A/G) polymorphism with susceptibility to autoimmune diseases: A meta-analysis with trial sequential analysis. Int Immunopharmacol. 2021 Jul;96():107617. doi: 10.1016/j.intimp.2021.107617. PMID: 33866246.