1. Survey Research Center, Institute for Social Research, University of MI, Ann Arbor, Michigan, USA
2. Department of Biostatistics, University of Michigan, Ann Arbor, Michigan, USA
3. Department of Health Behavior and Biological Sciences, School of Nursing, Center for the Study of Drugs, Alcohol, Smoking and Health, University of Michigan, Ann Arbor, Michigan, USA
4. Department of Systems, Populations and Leadership, School of Nursing, University of Michigan, Ann Arbor, Michigan, USA