aDivision of Pediatric Allergy, Immunology, and Pulmonary Medicine, Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee

bDivision of Pulmonology, Allergy/Immunology, Cystic Fibrosis and Sleep, Department of Pediatrics, Emory University School of Medicine

cChildren's Healthcare of Atlanta Division of Pulmonary Medicine, Atlanta, Georgia, USA

Correspondence to Leonard B. Bacharier, MD, Division of Allergy, Immunology, and Pulmonary Medicine, Monroe Carell Jr. Children's Hospital at Vanderbilt, 2200 Children's Way, Doctors’ Office Tower, Suite 11215, Nashville, TN 37232, USA. Tel: +1 615 936 5697; e-mail: [email protected]