1. Divisions of Palliative Care and Oncology, Department of Pediatrics, Children's Hospital and Medical Center, Omaha, Nebraska.
2. Center for Clinical and Translational Research and Treuman Katz Center for Pediatric Bioethics, Seattle Children's Research Institute, Seattle, Washington.
3. Divisions of Hematology/Oncology and Bioethics, Department of Pediatrics, University of Washington School of Medicine, Seattle, Washington.
4. National Institutes of Health, National Cancer Institute, Center for Cancer Research, Bethesda, Maryland.
5. Division of Biostatistics, University of Nebraska Medical Center, Omaha, Nebraska.