1. The RAND Corporation, Santa Monica, CA, USA
2. HSR&D Center for the Study of Healthcare Provider Behavior, VA Greater Los Angeles Healthcare System, Sepulveda, CA, USA
3. Semel Institute, Center for Health Services and Society, UCLA, Los Angeles, CA, USA
4. Healthy African American Families, Los Angeles, CA, USA
5. Charles R. Drew University of Medicine and Science, Los Angeles, CA, USA