1. NORC at the University of Chicago, Bethesda, Maryland
2. Canadian Centre on Substance Abuse, Ottawa, Ontario, Canada
3. Pacific Institute for Research and Evaluation, Calverton, Maryland
4. University of Maryland School of Medicine, Baltimore, Maryland
5. Canadian Association of Road Safety Professionals, St. Catharines, Ontario, Canada
6. University of Texas at Austin, School of Social Work, Austin, Texas
7. National Transportation Safety Board, Washington, D.C.
8. Highway Safety North, Ithaca, New York