Basra SS, Pokharel Y, Hira RS, Bandeali SJ, Nambi V, Deswal A, Nasir K, Martin SS, Vogel RA, Roberts AJ, Ballantyne CM, Virani SS. Relation between playing position and coronary artery calcium scores in retired National Football League players. Am J Cardiol. 2014 Dec 15; 114(12):1836-40.