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