1. Division of Hematology/Oncology, Department of Pediatric Oncology, Dana‐Farber Cancer Institute, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
2. Rheumatology Program, Division of Immunology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
3. Department of Pathology, Proteomics Center, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
4. Department of Laboratory Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
5. Division of Emergency Medicine, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA
6. Department of Pediatrics, Infectious and Immunological Diseases Research Center, Cedars‐Sinai Medical Center, Los Angeles, CA, USA
7. Department of Cardiology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA