1. Department of Anesthesiology, University of Colorado Anschutz Medical Campus, Aurora, CO.
2. Department of Surgery, Division of Cardiothoracic Surgery, University of Colorado Anschutz Medical Campus, Aurora, CO.
3. University of Colorado Hospital, University of Colorado Health, Aurora, CO.
4. Inpatient Rehabilitation Therapy Department, University of Colorado Hospital, University of Colorado Health, Aurora, CO.
5. Physical Therapy Program, Department of Physical Medicine and Rehabilitation, University of Colorado Anschutz Medical Campus, Aurora, CO.
6. Department of Medicine, University of Colorado School of Medicine, Aurora, CO.
7. VA Eastern Colorado Geriatric Research Education and Clinical Center, Denver, CO.
8. Department of Medicine, Pulmonary Sciences and Critical Care Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO.
9. Department of Medicine, Pulmonary and Critical Care Medicine, National Jewish Health, Denver, CO.