1. Birmingham Veterans Affairs Medical Center, Birmingham, AL, USA
2. VA Salt Lake City Health Care System, Salt Lake City, UT, USA
3. School of MedicineUniversity of Utah, Salt Lake City, UT, USA
4. School of Public HealthUniversity of Alabama at Birmingham, Birmingham, AL, USA
5. VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
6. David Geffen School of Medicine, University of California Los Angeles, Los Angeles, CA, USA
7. School of MedicineUniversity of Alabama at Birmingham, Birmingham, AL, USA
8. VA Pittsburgh Healthcare System, Pittsburgh, PA, USA
9. Suzanne Dworak-Peck School of Social WorkUniversity of Southern California, Los Angeles, CA, USA