Irene N Fung1, Emily M Berger2, Leslie Castelo-Soccio2, Terri F Brown-Whitehorn3. 1. Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pa. 2. Section of Dermatology, Children's Hospital of Philadelphia, Philadelphia, Pa. 3. Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, Pa. Electronic address: brownte@email.chop.edu.