1. From the Arrhythmia Service, Division of Cardiology (D.M.T., A.C.S., A.D.K., R.Y., G.J.K.), and Department of Pathology (C.G.), University of Western Ontario, and the Canadian Surgery Technologies and Advanced Robotics (CSTAR) (A.C.S., G.G., G.J.K.), London, Ontario, Canada.