1. a Department of Psychiatry , Washington University School of Medicine , St. Louis, Missouri
2. b University of Kentucky Center for Drug and Alcohol Abuse Research , Lexington, Kentucky
3. c Danya International , Silver Springs, Maryland
4. d University of Texas Health Science Center , San Antonio
5. e Substance Abuse Treatment Research program under the Health and Social Policy Division , Research Triangle Institute , Research Triangle Park, North Carolina
6. f University of Delaware