Husein, O. F., Husein, T. N., Gardner, R., Chiang, T., Larson, D. G., Obert, K., Thompson, J., Trudeau, M. D., Dell, D. M., & Forrest, L. A. (2008). Formal psychological testing in patients with paradoxical vocal fold dysfunction. Laryngoscope, 118(4), 740–747. PM:18182970