University of Alberta - School of Public Health, University of Minnesota - Twin Cities, Children's Hospital of Philadelphia - Department of Pediatrics, St. Jude Children’s Research Hospital - Department of Epidemiology and Cancer Control, University of Alberta - School of Public Health, St. Jude Children’s Research Hospital - Department of Epidemiology and Cancer Control, St. Jude Children’s Research Hospital - Department of Epidemiology and Cancer Control, St. Jude Children’s Research Hospital - Department of Epidemiology and Cancer Control, Fred Hutchinson Cancer Research Center - Public Health Sciences Division, University of Texas at Houston - MD Anderson Cancer Center, University of Alabama at Birmingham - Institute for Cancer Outcomes and Survivorship, St. Jude Children’s Research Hospital - Department of Epidemiology and Cancer Control, St. Jude Children’s Research Hospital - Department of Epidemiology and Cancer Control, St. Jude Children's Research Hospital - Department of Epidemiology, The Hospital for Sick Children - Division of Hematology/Oncology and University of Alberta - School of Public Health