Lack of association between cytotoxic T-lymphocyte antigen-4 + 49A/G polymorphism and psoriasis and vitiligo: A meta-analysis of case–control studies
Keywords: PTPN22, protein tyrosine phosphatase nonreceptor type 22; CTLA-4, cytotoxic T-lymphocyte antigen-4; SNPs, single-nucleotide polymorphisms; CNKI, China National Knowledge Infrastructure; ORs, odds ratios; 95% Cis, 95% confidence intervals; HWE, Hardy–Weinb