1 Department of Allergy & Immunology, Northwestern University Feinberg School of Medicine, Chicago, Ill.
2 Departments of Dermatology and Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Ill.
3 Department of Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Ill.
4 Department of Dermatology, The George Washington University School of Medicine and Health Sciences, Washington, DC.
5 Department of Pediatrics, Division of Allergy-Immunology, Ann & Robert H. Lurie Children's Hospital of Chicago, Northwestern University Feinberg School of Medicine, Chicago, Ill. Electronic address: afishbein@luriechildrens.org.