1. Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455;
2. Department of Surgery, University of Minnesota, Minneapolis, MN 55455
3. Cardiology Division, Veteran Affairs and Georgetown University Medical Center, Washington, DC 20007
4. Department of Surgery, University of Minnesota, Minneapolis, MN 55455;
5. Medtronic LLC, Mounds View, MN 55112