1 Division of Allergy & Immunology, Department of Pediatrics and Medicine, Morsani College of Medicine, University of South Florida, Tampa, Fla; Division of Allergy & Immunology, Department of Medicine, Johns Hopkins All Children's Hospital, St. Petersburg, Fla; Division of Allergy and Immunology, Massachusetts General Hospital for Children, Boston, Mass. Electronic address: jolanwalter@health.usf.edu.
2 Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pa.