Rhodes J, Margossian R, Sleeper LA, Barker P, Bradley TJ, Lu M, Fogel M, Harris MA, Lai WW, Powell AJ, Puchalski MD, Shirali G, Colan SD. Non-geometric echocardiographic indices of ventricular function in patients with a Fontan circulation. J Am Soc Echocardiogr. 2011 Nov; 24(11):1213-9.