1. School of Nursing, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
2. Health Sciences Library, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
3. Department of Epidemiology, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
4. UNC Lineberger Comprehensive Cancer Center, Chapel Hill, North Carolina, USA.
5. Department of Pediatric Hematology/Oncology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
6. Department of Nutrition, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
7. Department of Biostatistics, Gillings School of Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.