1. From the Department of Pediatric Oncology and the Center for Outcomes and Policy Research, Dana-Farber Cancer Institute, Boston, MA; Harvard Medical School, Boston, MA; Pediatric Advanced Care Team, Department of Medical Ethics, PolicyLab, The Children's Hospital of Philadelphia, Philadelphia, PA; Department of Pediatrics, The Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA; Children's National Medical Center, Washington, DC; The George Washington University, Washington, DC.