1Department of Epidemiology, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, Arkansas.
2Winthrop P. Rockefeller Cancer Institute, University of Arkansas for Medical Sciences, Little Rock, Arkansas.
3Peter O'Donnell School of Public Health, University of Texas Southwestern Medical Center, Dallas, Texas.
4Harold C. Simmons Comprehensive Cancer Center, University of Texas Southwestern Medical Center, Dallas, Texas.
5Division of Hematology-Oncology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas.
6Dan L. Duncan Comprehensive Cancer Center, Baylor College of Medicine, Houston, Texas.
7Department of Pediatrics, Benioff Children's Hospitals, University of California San Francisco, San Francisco, California.
8Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia.
9Aflac Cancer and Blood Disorders Center, Children's Healthcare of Atlanta, Atlanta, Georgia.