[1] Northwestern Univ, Feinberg Sch Med, Dept Med, Div Allergy Immunol, Chicago, IL 60610 USA
[2] Univ Hosp Munster, Dept Otorhinolaryngol Head & Neck Surg, Munster, Germany
[3] Sun Yat Sen Univ, Affiliated Hosp 1, Int Airway Res Ctr, Dept Otorhinolaryngol, Guangzhou, Peoples R China
[4] Univ Ghent, Fac Med, Dept Otorhinolaryngol, Upper Airways Res Lab, Ghent, Belgium
[5] Ctr Hosp Univ Montreal CRCHUM, Ctr Rech, Montreal, PQ, Canada
[6] Univ Hosp Leuven, Dept Otorhinolaryngol, Leuven, Belgium
[7] Univ Ghent, Fac Med, Upper Airways Res Lab, Ghent, Belgium
[8] Northwestern Univ, Feinberg Sch Med, Div Allergy & Immunol, Chicago, IL 60610 USA