aAllergy and Asthma Center, University Hospital of Verona

bDepartment of Medicine, University of Verona, Verona, Italy

cDivision of Allergy and Immunology, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA

Correspondence to Bianca Olivieri, MD, University of Verona, Verona, Veneto, Italy. E-mail: [email protected]