. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Heart Rhythm. 2013 Aug 6;10(12):10.1016/j.hrthm.2013.08.003. doi: 10.1016/j.hrthm.2013.08.003
© 2013 The Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.