1. Division of Cardiology, University of Colorado School of Medicine, Aurora, Colorado.
2. Adult and Children Center for Outcomes Research and Delivery Sciences (ACCORDS), University of Colorado School of Medicine, Aurora, Colorado.
3. Colorado Cardiovascular Outcomes Research Group, Denver, Colorado.
4. Department of Kinesiology and Integrative Physiology, Michigan Technological University, Houghton, Michigan.
5. Divisions of Pulmonary, Critical Care and Sleep Medicine, and Obstetric Medicine, Department of Medicine, The Miriam Hospital, Warren Alpert Medical School of Brown University, Providence, Rhode Island.