Affiliation: | 1. Iowa Consortium for Substance Abuse Research and Evaluation, University of Iowa, , Iowa City, IA, USA;2. Department of Biostatistics, College of Public Health, University of Iowa, , Iowa City, IA, USA;3. Department of Occupational and Environmental Health, College of Public Health, University of Iowa, , Iowa City, IA, USA;4. Department of Psychiatry, Roy J and Lucille A Carver College of Medicine, University of Iowa, , Iowa City, IA, USA;5. Iowa City VA Medical Center, , Iowa City, IA, USA |