1. Department of Surgery, University of Washington Medical Center, Seattle2University of Washington Surgical Outcomes Research Center, Seattle3Department of Global Health, University of Washington, Seattle
2. Department of Surgery, University of Washington Medical Center, Seattle2University of Washington Surgical Outcomes Research Center, Seattle
3. University of Washington Surgical Outcomes Research Center, Seattle4Providence Regional Medical Center, Everett, Washington
4. Department of Surgery, Swedish Medical Center, Seattle, Washington
5. Skagit Valley Hospital, Mt Vernon, Washington
6. Department of Surgery, University of Washington Medical Center, Seattle3Department of Global Health, University of Washington, Seattle
7. Department of Surgery, Madigan Army Medical Center, Ft Lewis, Tacoma, Washington
8. Department of Surgery, Virginia Mason Medical Center, Seattle, Washington