1. RAND Health, Santa Monica, California.
2. Department of Medicine, West Los Angeles Veterans Affairs Medical Center, West Los Angeles, California.
3. Department of Medicine, University of California, Los Angeles, Los Angeles, California.
4. Department of Veteran Affairs Desert Pacific Mental Illness Research, Education, and Clinical Center, Los Angeles, California.
5. Department of Psychiatry, University of California, Los Angeles, Los Angeles, California.
6. VA South Central Mental Illness Research, Education, and Clinical Center, North Little Rock, Arkansas.
7. Department of Psychiatry, University of Arkansas for Medical Sciences, Little Rock, Arkansas.