Aaron CP, Tandri H, Barr RG, Johnson WC, Bagiella E, Chahal H, Jain A, Kizer JR, Bertoni AG, Lima JA, Bluemke DA, Kawut SM. Physical activity and right ventricular structure and function. The MESA-Right Ventricle Study. Am J Respir Crit Care Med. 2011 Feb 01; 183(3):396-404.