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