Aldrich MC, Kumar R, Colangelo LA, Williams LK, Sen S, Kritchevsky SB, Meibohm B, Galanter J, Hu D, Gignoux CR, Liu Y, Harris TB, Ziv E, Zmuda J, Garcia M, Leak TS, Foreman MG, Smith LJ, Fornage M, Liu K, Burchard EG. Genetic ancestry-smoking interactions and lung function in African Americans: a cohort study. PLoS One. 2012; 7(6):e39541.