Speechley M, Barton JC, Passmore L, Harrison H, Reboussin DM, Harris EL, Rivers CA, Fadojutimi-Akinsiku M, Wenzel L, Diaz S. Potential nonresponse bias in a clinical examination after initial screening using iron phenotyping and HFE genotyping in the hemochromatosis and iron overload screening study. Genet Test Mol Biomarkers. 2009 Dec; 13(6):721-8.