Lin, Shaopeng, Mingyu He, and Junmin Chen. “Tumor Necrosis Factor-Alpha Inhibitor Combined With Methotrexate for Ankylosing Spondylitis: A Systematic Review and Meta-Analysis”. Rheumatology Reports 6, no. 1 (June 10, 2014). Accessed May 4, 2024. https://www.pagepress.org/journals/rr/article/view/5127.