1 Section of Allergy and Immunology, Department of Pediatrics, Children's Hospital Colorado, University of Colorado School of Medicine, Aurora, Colorado. Electronic address: Matthew.Greenhawt@childrenscolorado.org.
2 Division of Allergy and Immunology, The University of Tennessee, Memphis, Tennessee.
3 Division of Emergency Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio.
4 Dartmouth-Hitchcock Medical Center, Section of Allergy and Immunology, Lebanon, New Hampshire; Dartmouth Geisel School of Medicine, Hanover, New Hampshire.
5 Division of Allergy and Immunology, Department of Pediatrics, Children's Hospital of Philadelphia, Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania.