1. Center for Healthcare Organization and Implementation Research, VA Boston Healthcare System, Boston, Massachusetts
2. Department of Surgery, Boston University School of Medicine, Boston, Massachusetts
3. Birmingham and Tuscaloosa Health Services Research and Development Unit, Birmingham VA Medical Center, Birmingham, Alabama
4. Department of Surgery, University of Alabama at Birmingham
5. Medicine Division, Milwaukee VA Medical Center, Milwaukee, Wisconsin
6. Department of Surgery, Medical College of Wisconsin, Milwaukee
7. VA Palo Alto Medical Center, Palo Alto, California
8. Department of Surgery, Stanford University School of Medicine, Palo Alto, California
9. VA Central Western Massachusetts Healthcare System, Leeds
10. University of Massachusetts Medical School, Worcester
11. Baylor Scott & White Health, Center for Applied Health Research, Temple, Texas
12. Harvard University School of Medicine, Boston, Massachusetts