1. Centre for Heart Rhythm Disorders, University of Adelaide, Australia (C.J.O., M.E.M., J.M.H., A.G.B., G.T., M.E., A.T., D.H.L., P.S.).
2. Department of Cardiology, Royal Adelaide Hospital, Australia (C.J.O., M.E.M., J.M.H., M.E., A.T., D.H.L., P.S.).
3. College of Nursing and Health Sciences, Flinders University, Adelaide, Australia (J.M.H.).
4. PaceMate, Bradenton, FL (C.H.).
5. Iowa Heart Center, Iowa City, IA (S.F.).
6. Kansas City Heart Rhythm Institute, Kansas City, MO (R.G.).
7. Cardiovascular Medicine, Cleveland Clinic, Cleveland, OH (N.V.).
8. Health First Heart and Vascular, Melbourne, FL (KC).