1. VA Puget Sound Health Care SystemSeattle, Washington
2. University of WashingtonSeattle, Washington
3. University of British ColumbiaVancouver, British Columbia, Canada
4. VA Portland Health Care SystemPortland, Oregon
5. Oregon Health and Science UniversityPortland, Oregon
6. University of California, San FranciscoSan Francisco, California
7. Department of Veterans AffairsWashington, DC