1. The Division of Pediatric Hematology/Oncology, University of North Carolina, Chapel Hill, North Carolina.
2. The Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, North Carolina.
3. The Department of Epidemiology, UNC Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina.
4. The Department of Psychiatry, University of North Carolina, Chapel Hill, North Carolina.