Lightfoot T, Skibola C, Smith A, Forrest M, Adamson P, Morgan G, Bracci P, Roman E, Smith M, Holly E. Polymorphisms in the oxidative stress genes, superoxide dismutase, glutathione peroxidase and catalase and risk of non-Hodgkin’s lymphoma. Haematologica 2006; 91(9):1222-1227.