Deyell Marc W, Patel Rutuke K, Cooper Joshua M
Division of Cardiovascular Medicine, Section of Electrophysiology, University of Pennsylvania Health System, Philadelphia, Pennsylvania, USA.
Pacing Clin Electrophysiol. 2012 May;35(5):616-21. doi: 10.1111/j.1540-8159.2011.03235.x. Epub 2011 Oct 5.