1. Department of Anesthesiology, University of Nebraska Medical Center, Omaha, Nebraska
2. Outcomes Research Consortium, Cleveland, Ohio
3. Department of Anesthesiology, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
4. Department of Anesthesiology, University of Colorado School of Medicine, Aurora, Colorado
5. Department of Anesthesiology, Beth Israel Deaconess Medical Center, Boston, Massachusetts
6. Department of Anesthesiology and Critical Care Medicine, Johns Hopkins University, Baltimore, Maryland
7. Department of Anesthesiology, Perioperative and Pain Medicine, Stanford University, Palo Alto, California
8. Department of Anesthesiology, University of Maryland, Baltimore, Maryland
9. Department of Anesthesiology and Pain Management, University of Texas Southwestern Medical Center, Dallas, Texas
10. Department of Cardiology, Uganda Heart Institute, Kampala, Uganda
11. Department of Intensive Care and Resuscitation, Cleveland Clinic, Cleveland, Ohio
12. Department of Anesthesiology, University of Washington, Seattle, Washington
13. Department of Outcomes Research, Cleveland Clinic, Cleveland, Ohio.