1. Center for Mental Health Outcomes and Research, Central Arkansas Veterans Healthcare System, North Little Rock, Arkansas, United States
2. South Central Mental Illness Research Education and Clinical Center, Department of Veterans Affairs, Washington, District of Columbia, United States
3. Center for Health Services Research, Department of Psychiatry, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
4. Department of Physiology and Cell Biology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States
5. Department of Biostatistics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States