1. Department of Medicine, Duke University Medical Center, Durham, North Carolina2Health Services Research and Development Service, Durham VA Medical Center, Durham, North Carolina
2. Department of Pediatrics, Indiana University School of Medicine, Indianapolis
3. Cancer Prevention, Detection, and Control Research Program, Duke Cancer Institute, Durham, North Carolina5Department of Community and Family Medicine, Duke University School of Medicine, Durham, North Carolina
4. Division of Adolescent Medicine, Nationwide Children’s Hospital, The Ohio State University, Columbus
5. Department of Medicine, Duke University Medical Center, Durham, North Carolina
6. Department of Community and Family Medicine, Duke University School of Medicine, Durham, North Carolina
7. Department of Human Development and Family Studies, Purdue University, West Lafayette, Indiana