1. Eastern Colorado Health Care System, Department of Veterans Affairs Medical Center, Denver, Colorado, Northport Department of Veterans affairs Medical Center, Northport, New York,
2. Department of Veterans Health Affairs Central Office, Washington, DC
3. Eastern Colorado Health Care System, Department of Veterans Affairs Medical Center, Denver, Colorado
4. Eastern Colorado Health Care System, Department of Veterans Affairs Medical Center, Denver, Colorado, Department of Surgery, University of Colorado at Denver and Health Science Center, Denver, Colorado