1. Division of Cardiovascular Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
2. Medtronic, Inc, Minneapolis, MN
3. Division of Cardiovascular Medicine, Mayo Clinic, Rochester, MN
4. Département de Cardiologie, Centre Hospitalier Universitaire de Caen, Rennes, France
5. Division of Cardiology, Medical University of South Carolina, Charleston, SC
6. Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
7. Department of Cardiology, Karolinska University Hospital, Stockholm, Sweden
8. Department of Medicine, Karolinska Institutet, Stockholm, Sweden