1. Vanderbilt University Nashville Tennessee USA
2. Royal Adelaide Hospital Adelaide South Australia Australia
3. Azienda Ospedaliera Papa Giovanni XXIII Bergamo Italy
4. Department of Cardiovascular Medicine, Cleveland Clinic Cleveland Ohio USA
5. Städtische Kliniken Bielefeld Germany
6. The Children's Hospital Philadelphia Pennsylvania USA
7. University of Virginia Medical Center Charlottesville Virginia USA
8. Bakken Research Center, Medtronic Inc. Maastricht The Netherlands
9. Medtronic, Inc. Mounds View Minnesota USA