1. Division of STD Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Department of Health Care Policy, Harvard Medical School, Boston, Massachusetts
3. Center for Health Research, Kaiser Permanente Northwest, Portland, Oregon
4. Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado
5. Department of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado
6. Center for Clinical and Outcomes Research, Kaiser Permanente Georgia, Atlanta, Georgia