Garcia-Albeniz X, Hsu J, Lipsitch M, Bretthauer M, Logan RW, Hernandez-Diaz S, Hernan MA. Colonoscopy and risk of infective endocarditis in the elderly. J Am Coll Cardiol. 2016 Aug 2;68(5):570-1. doi: 10.1016/j.jacc.2016.05.041