1. Department of PediatricsWashington University in St Louis St. Louis Missouri
2. Department of Psychosocial Oncology and Palliative CareDana‐Farber Cancer Institute Boston Massachusetts
3. Department of MedicineBoston Children's Hospital Boston Massachusetts
4. Faculty of Population Health Sciences, Louis Dundas Centre for Children's Palliative CareUCL Great Ormond Street Institute of Child Health London United Kingdom
5. Louis Dundas Centre for Children's Palliative CareGreat Ormond Street Hospital for Children NHS Foundation Trust London United Kingdom