. Author manuscript; available in PMC: 2013 Dec 7.
Published in final edited form as: Heart Rhythm. 2011 Jul 6;8(11):10.1016/j.hrthm.2011.06.032. doi: 10.1016/j.hrthm.2011.06.032
© 2011 The Heart Rhythm Society. Published by Elsevier Inc. All rights reserved.