1. College of the Liberal Arts, Penn State University, University Park, Pennsylvania
2. Department of Public Health Sciences, University of Chicago, Chicago, Illinois
3. Department of Pediatrics, University of Chicago, Chicago, Illinois
4. Children’s Oncology Group Statistics and Data Center, Department of Biostatistics, University of Florida, Gainesville
5. Seattle Children’s Hospital, University of Washington, Seattle
6. Boston Children’s Hospital and Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts