1. Division of Pediatric Palliative Care, Children's Hospital and Medical Center, Omaha, Nebraska, USA.
2. Pediatric Oncology Branch, National Cancer Institute, Center for Cancer Research, National Institutes of Health, Bethesda, Maryland, USA.
3. Division of Oncology, Children's National Medical Center, Washington, DC, USA.
4. College of Nursing, Wayne State University, Detroit, Michigan, USA.
5. Pediatric Critical Care and Pediatric Ethics Program, Division of Pediatric Critical Care Medicine, Department of Pediatrics, Children's National Health System, Washington, DC, USA.
6. Department of Family and Community Health, University of Maryland School of Nursing, Baltimore, Maryland, USA.
7. Children's National Hospital/Center for Translational Science and George Washington School of Medicine and Health Sciences, Washington, DC, USA.