1. Alcohol Research Group, Medical Research Institute of San Francisco, 1816 Scenic Avenue, Berkeley CA 94709 and Department of Urban Studies, Rutgers University, New Brunswick, NJ 08903
2. Division of General Internal Medicine, University of California, San Francisco CA 94143
3. Survey Research Center, University of California, Berkeley CA 94720
4. Department of Psychiatry, School of Medicine and Institute for Social Research, University of Michigan, Ann Arbor MI 48109