1. Department of Otorhinolaryngology; Medical School, Democritus University of Thrace; Alexandroupolis Greece
2. Laboratory of Hygiene and Environmental Protection; Medical School, Democritus University of Thrace; Alexandroupolis Greece
3. Allergy Unit “D. Kalogeromitros”; 2nd Department of Dermatology and Venereology, Medical School, University of Athens, “Attikon” University Hospital; Athens Greece
4. Upper Airway Research Laboratory; Department of Otorhinolaryngology, Ghent University Hospital; Ghent Belgium