1. Department of Psychiatry, Columbia University and New York State Psychiatric Institute, New York, New York.
2. Social Science Research Center, Mississippi State University, Starkville, Mississippi.
3. Institute of Behavioral Research, Texas Christian University, Fort Worth, Texas.
4. Chestnut Health Systems, Normal, Illinois.
5. Department of Sociology and Center on Drug and Alcohol Research, College of Medicine, University of Kentucky, Lexington, Kentucky.
6. Department of Behavioral Science, Center on Drug and Alcohol Research, College of Medicine, University of Kentucky, Lexington, Kentucky.
7. Department of Social and Behavioral Sciences, New York University, New York, New York.