1. School of Medicine and Public Health, University of Wisconsin-Madison, Madison, WI, USA.
2. Research Fellow, Department of Anesthesiology, Mayo Clinic, Rochester, MN, USA.
3. Consultant, Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USA.
4. Department of Kinesiology, University of Toledo, OH, USA.
5. Division of Cardiovascular Diseases, Mayo Clinic, Rochester, MN, USA.
6. School of Kinesiology, University of Minnesota, Minneapolis, MN, USA.