Genetic variations in the IL-12B gene in association with IL-23 and IL-12p40 serum levels in ankylosing spondylitis (2019)
https://pubmed.ncbi.nlm.nih.gov/30443744/

Association of single nucleotide polymorphism at position -308 of the tumor necrosis factor-alpha gene with ankylosing spondylitis and rheumatoid arthritis (2014)
https://pubmed.ncbi.nlm.nih.gov/26019597/