Owen, S A, Lunt, M, Bowes, J, Hider, S L, Bruce, I N, Thomson, W, Barton, A, "MTHFR gene polymorphisms and outcome of methotrexate treatment in patients with rheumatoid arthritis: analysis of key polymorphisms and meta-analysis of C677T and A1298C polymorphisms", The Pharmacogenomics Journal, 2013