[1] Univ Amsterdam, Acad Med Ctr, Dept Otorhinolaryngol, NL-1100 DD Amsterdam, Netherlands
[2] Allergy & Asthma Med Grp & Res Ctr, San Diego, CA USA
[3] Ghent Univ Hosp, ENT Dept, B-9000 Ghent, Belgium
[4] Cent Hosp Univ, Hop Arnaud de Villeneuve, Dept Resp Dis, Montpellier, France