Johns Hopkins University School of Medicine, Department of Otolaryngology-Head and Neck Surgery, Division of Rhinology, Department of Medicine, Division of Allergy and Clinical Immunology, Baltimore, Maryland, USA

Correspondence to Jean Kim, MD, PhD, Johns Hopkins Asthma and Allergy Center, Johns Hopkins Bayview Medical Center, 4940 Eastern Ave, Suite A102B, Baltimore, MD 21224, USA. Tel: +1 410 550 2644; e-mail: [email protected]