1. Oregon State University, Corvallis, OR, USA
2. VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
3. Department of Veterans Affairs, Eastern Colorado Health Care System, Denver, CO, USA
4. School of Medicine, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
5. Portland VA Medical Center, Portland, OR, USA
6. Oregon Health and Science University, Portland, OR, USA
7. Lebanon VA Medical Center, Lebanon, PA, USA
8. Geffen School of Medicine at UCLA, Los Angeles, CA, USA