1. From the Division of Cardiothoracic Surgery, Department of Surgery (Hunt, Stuart, Gergen, Mitchell, Meguid), University of Colorado, Aurora, CO
2. Division of Cardiopulmonary Imaging, Department of Radiology (Bang), University of Colorado, Aurora, CO
3. Critical Care and Pulmonary Sleep Associates, Aurora, CO (Reihman)
4. Adult and Child Consortium for Health Outcomes Research, University of Colorado School of Medicine, Aurora, CO (Helmkamp)
5. Department of Cardiothoracic Surgery, Stanford University, Palo Alto, CA (Lin)
6. Division of Cardiothoracic Surgery, Department of Surgery, University of Virginia, Charlottesville, VA (Scott)
7. the Division of Cardiothoracic Surgery, Department of Surgery, Munson Medical Center, Traverse City, MI (Wojcik).