1. Department of Anesthesiology and Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, United States
2. Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign IL, Champaign, Illinois, United States
3. Department of Kinesiology, Michigan State University, East Lansing, Michigan, United States
4. Departments of Physiology and Mathematics, University of Arizona, Tucson, Arizona, United States