1. Department of Pediatrics, The Hospital for Sick Children, Toronto, Canada;
2. Department of Pediatrics and Institute of Health Policy, Management, and Evaluation, University of Toronto, Toronto, Canada;
3. Complex Care Service, Division of General Pediatrics, Boston Children’s Hospital and Harvard Medical School, Harvard University, Boston, Massachusetts;
4. Center for Policy, Outcomes and Prevention (CPOP) and
5. Department of Pediatrics, School of Medicine, Stanford University, Stanford, California; and
6. Lucile Packard Foundation for Children’s Health, Palo Alto, California