1. Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, Pennsylvania2University of Pittsburgh, Pittsburgh, Pennsylvania
2. Atlanta Veterans Affairs Medical Center, Atlanta, Georgia4Emory University, Atlanta, Georgia
3. University of Nebraska Medical Center, Omaha
4. University of Nebraska Medical Center, Omaha6Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska
5. Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska7University of Utah School of Medicine, Salt Lake City
6. Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, Nebraska
7. Veterans Affairs Central Office, Washington, DC