1. Ben Towne Center for Childhood Cancer Research, Seattle Children’s Research Institute, Seattle, WA;
2. Department of Pediatrics, University of Washington, Seattle, WA;
3. Center for Clinical and Translational Research, Seattle Children’s Research Institute, Seattle, WA;
4. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA;
5. Clinical Statistics Group, Juno Therapeutics, Inc., Seattle, WA; and
6. Department of Medicine, University of Washington, Seattle, WA