Kaku K, Takeuchi M, Otani K, Sugeng L, Nakai H, Haruki N, Yoshitani H, Watanabe N, Yoshida K, Otsuji Y, Mor-Avi V, Lang RM. Age- and gender-dependency of left ventricular geometry assessed with real-time three-dimensional transthoracic echocardiography. J Am Soc Echocardiogr. 2011 May; 24(5):541-7.