1. Division of Hospital Medicine, Department of Pediatrics, Children's National Medical Center, Pediatric Palliative Care Program, Washington, District of Columbia
2. Division of Newborn Medicine, Boston Children's Hospital, Boston, Massachusetts
3. Division of Medical Critical Care, Boston Children's Hospital, Boston, Massachusetts
4. Department of Psychosocial Oncology and Palliative Care and Department of Pediatrics, Dana-Farber Cancer Institute, Boston Children's Hospital, Boston, Massachusetts