1. From the Department of Cardiovascular Medicine, Mayo Clinic , 200 First Street S.W., Rochester, MN 55905 , USA
2. Department of Echocardiography, Cardio X Clinic , Cannes , France
3. The Davidai Center for Rhythm Disturbances and Pacing, Chaim Sheba Medical Center, Tel Hashomer and the Sackler School of Medicine, Tel Aviv University , Ramat-Gan , Israel
4. Department of Cardiovascular Medicine, Allina Health Minneapolis Heart Institute – Abbott Northwestern Hospital , 800 E 28th St, Minneapolis, MN 55407 , USA