1. Department of Pediatrics Boston Children's Hospital Boston Massachusetts USA
2. Department of Pediatrics Boston Medical Center Boston Massachusetts USA
3. Present address: Daniel J. Zheng, Children's Hospital of Philadelphia Philadelphia PA USA
4. Department of Pediatric Oncology and Division of Population Sciences Dana‐Farber Cancer Institute Boston Massachusetts USA
5. Department of Psychosocial Oncology and Palliative Care Dana‐Farber Cancer Institute Boston Massachusetts USA
6. Harvard Medical School Boston Massachusetts USA
7. Department of Pediatric Oncology Emma Children's Hospital, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Center Amsterdam Amsterdam The Netherlands
8. Present address: Emily R. Schwartz, Harvard Medical School Boston MA USA
9. Department of Pediatrics Baylor College of Medicine Houston Texas USA
10. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
11. Present address: Clement Ma, Center for Addiction and Mental Health Toronto ON Canada