1 Iowa Consortium for Substance Abuse Research and Evaluation, University of Iowa, 100 MTP4, Iowa City, IA, 52245-5000, USA. [email protected].
2 Department of Psychiatry, Carver College of Medicine, University of Iowa, 200 Hawkins Drive, Iowa City, IA, 52242, USA. [email protected].
3 Department of Biostatistics, College of Public Health, University of Iowa, 145 N. Riverside Drive, Iowa City, IA, 52245-5000, USA. [email protected].
4 Iowa Consortium for Substance Abuse Research and Evaluation, University of Iowa, 100 MTP4, Iowa City, IA, 52245-5000, USA.