1. Department of Psychology, Neurocognitive Laboratory, University of Florida, Gainesville, Florida, USA
2. James A. Haley Veteran's Administration Medical Center, Tampa, Florida, USA
3. American Indian Research Group of Oklahoma, Oklahoma Center for Alcohol, Oklahoma, USA
4. Drug-Related Studies, University of Oklahoma Health Sciences Center
5. Oklahoma State Department of Human Services, Oklahoma City, Oklahoma, USA
6. Statistically Speaking, LLP, Meridian, Idaho, USA