1. Department of Anesthesiology University of Virginia Health System Charlottesville Virginia USA
2. University of Virginia School of Medicine Charlottesville Virginia USA
3. Division of Cardiovascular Medicine, Department of Medicine University of Virginia Health System Charlottesville Virginia USA
4. Division of Cardiology, Department of Medicine University Hospitals Cleveland Medical Center, Case Western Reserve University Cleveland Ohio USA
5. Division of Cardiovascular Medicine Beaumont Hospital Royal Oak Michigan USA
6. Division of Cardiology, Department of Medicine University of Washington Seattle Washington USA
7. Division of Cardiovascular Medicine Indiana University Indianapolis Indiana USA