1. Department of Preventive and Community Dentistry; University of Iowa; Iowa City Iowa
2. Cecil G. Sheps Center for Health Services Research; University of North Carolina; Chapel Hill North Carolina
3. School of Social Work; University of North Carolina; Chapel Hill North Carolina
4. Department of Psychiatry and Behavioral Sciences; Duke University; Durham North Carolina
5. Department of Family Medicine; University of North Carolina; Chapel Hill North Carolina
6. Clinical Research Institute, School of Medicine; Duke University; Durham North Carolina