1 Department of Child and Adolescent Psychiatry and Behavioral Sciences, Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pa.
2 Food Allergy Center, Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pa.
3 Food Allergy Center, Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pa; Department of Pediatrics, Perelman School of Medicine, Philadelphia, Pa. Electronic address: spergel@email.chop.edu.