From the Sidney Kimmel Medical College at Thomas Jefferson University (L.D.N.), Philadelphia, PA; Department of Pediatrics (C.G.R., D.O.K.), Division of Pediatric Emergency Medicine, Morgan Stanley Children's Hospital of NY Presbyterian, Columbia University Medical Center, New York, NY; Department of Pediatrics (M.A.A.), Division of Pediatric Emergency Medicine, Yale University School of Medicine, New Haven, CT; Department of Pediatrics (A.W.C.), Division of Pediatric Critical Care, University of Louisville School of Medicine, Louisville, KY; and Department of Pediatrics (M.D.A.), Division of Pediatric Emergency Medicine, Northwestern University Feinberg School of Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL.