1. Center for the Study of Drugs, Alcohol, Smoking and Health, University of Michigan School of Nursing, Ann Arbor (all authors); Institute for Social Research (S. E. McCabe, Schulenberg, Veliz) and Department of Psychiatry (V. V. McCabe), University of Michigan, Ann Arbor; Department of Psychiatry, Massachusetts General Hospital, Boston (Wilens); Department of Psychology, Texas State University, San Marcos (Schepis).