1 Arrhythmia Center of the Department of Cardiovascular Services-Piedmont Heart Institute and Piedmont Atlanta Hospital, Atlanta, Georgia. Electronic address: thomas.deering@piedmont.org.
2 Department of Cardiovascular Disease, Mayo Clinic, Jacksonville, Florida.
3 Arrhythmia Center of the Department of Cardiovascular Services-Piedmont Heart Institute and Piedmont Atlanta Hospital, Atlanta, Georgia; Medical College of Georgia, Atlanta, Georgia.