1. VA Palo Alto Health Care System, Palo Alto, California, and Stanford University School of Medicine; Stanford California
2. Jackson VA Medical Center and University of Mississippi; Jackson
3. Omaha VA Medical Center and University of Nebraska Medical Center; Omaha
4. Dallas VA Medical Center and Texas Southwestern University Medical Center; Dallas
5. Department of Veterans Affairs, Denver and University of Colorado School of Medicine; Denver
6. George E. Wahlen VA Medical Center and University of Utah; Salt Lake City
7. Washington DC VA Medical Center and Georgetown University; Washington DC