| Affiliation: | 1. The Children's Hospital of Philadelphia, , Philadelphia, Pennsylvania;2. Children's National Medical Center, , Washington, District of Columbia;3. University of Memphis School of Public Health and St Jude Children's Research Hospital, , Memphis, Tennessee;4. Washington University School of Medicine, , St Louis, Missouri;5. Children's Hospital of Los Angeles, , Los Angeles, California;6. Abbott Laboratories, , Abbott Park, Illinois;7. Boston Children's Hospital and Dana‐Farber Harvard Cancer Center, , Boston, Massachusetts;8. Seattle Children's Hospital, , Seattle, Washington;9. University of Chicago, , Chicago, Illinois;10. Children Oncology Group Statistics and Data Center, , Gainesville, Florida |
