1. aDepartment of Pediatrics, University of Utah School of Medicine, Primary Children’s Hospital, Salt Lake City, Utah
2. bDepartment of Pediatrics, Virginia Commonwealth University, Richmond, Virginia
3. cDepartments of Pediatrics, Emergency Medicine and Radiology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
4. dDepartment of Pediatrics, Stanford University School of Medicine, Palo Alto, California
5. eCentre for Evidence-Based Medicine, Nuffield Department of Primary Care Health Sciences, University of Oxford, Oxford, United Kingdom
6. fDepartment of Neonatology, Beth Israel Deaconess Medical Center, Boston, Massachusetts
7. gDepartment of Pediatrics, Harvard Medical School, Boston, Massachusetts