1. Department of Anesthesiology
2. School of Medicine, University of North Carolina, Chapel Hill, North Carolina
3. Department of Anesthesiology, University of Mississippi Medical Center, Jackson, Mississippi
4. Department of Anesthesiology, University of Colorado, Aurora, Colorado
5. Department of Anesthesia & Operative Services, Womack Army Medical Center, Ft. Liberty, North Carolina
6. Department of Anesthesiology and Pain Medicine, University of Washington, Harborview Medical Center, Seattle, Washington
7. University of North Carolina Health Enterprises University of North Carolina Health Care System, Chapel Hill, North Carolina.