1. Department of Anesthesiology, University of Colorado, Denver, CO, USA
2. Cardiothoracic Anesthesiology, Department of Anesthesiology, University of Colorado, Denver CO, USA
3. Department of Anesthesiology, University of Colorado School of Medicine, Denver, CO, USA
4. Division of Cardiothoracic Anesthesiology, Department of Anesthesiology, Vanderbilt University Medical Center, Nashville, TN, USA