1. Department of Cardiology, Karolinska University Hospital, S- 17176, Stockholm, Sweden
2. Division of Cardiology, Medical University of South Carolina, Charleston, SC, USA
3. Division of Cardiovascular Medicine and the Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH, USA
4. University of Pennsylvania Medical Center, Philadelphia, PA, USA
5. Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
6. Medtronic, Inc, Minneapolis, MN, USA
7. Département de Cardiologie, CHU, INCERM, CIC_IT 804 Rennes, France