1. Department of Cardiothoracic Surgery, Stanford University, Palo Alto, CA.
2. Department of Physical Therapy, College of Health Sciences, University of Kentucky, Lexington, KY.
3. Department of Surgery, University of Colorado, Anschutz Medical Campus, Aurora, CO.
4. Division of Pulmonary Sciences and Critical Care, Department of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO.
5. Division of Pulmonary and Critical Care Medicine, Department of Medicine, University of Virginia, Charlottesville, VA.
6. Division of Cardiothoracic Surgery, Department of Surgery, College of Medicine, University of Kentucky, Lexington, KY.
7. Division of Allergy, Pulmonary and Critical Care Medicine, Department of Medicine, Vanderbilt University, Nashville, TN.
8. Division of Cardiothoracic Surgery, Department of Surgery, University of Colorado, Anschutz Medical Campus, Aurora, CO.