1 Center for Food Allergy and Asthma Research, Northwestern University Feinberg School of Medicine, Chicago, Ill.
2 Division of Pulmonary and Critical Care Medicine, Department of Medicine, Stanford University, Stanford, Calif; Allergy, Asthma, and Immunodeficiency, Stanford Health Care, Stanford, Calif.
3 San Francisco ENT Otolaryngology, San Francisco, Calif.
4 Center for Food Allergy and Asthma Research, Northwestern University Feinberg School of Medicine, Chicago, Ill; Department of Pediatrics & Medicine, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Ill. Electronic address: r-gupta@northwestern.edu.