1. University Department of Ear, Nose and Throat Diseases; Medical University of Vienna; Vienna Austria
2. Laboratory for Palynology; Department of Biology and Ecology; Faculty of Sciences; University of Novi Sad; Novi Sad Serbia
3. Icelandic Institute of Natural History; Reykjavik Iceland
4. Siauliai University; Siauliai Lithuania
5. Charité - Universitätsmedizin Berlin; Berlin Germany
6. Department of Infection, Immunity and Inflammation; Institute for Lung Health; University of Leicester; Leicester UK
7. Department of Pulmonology; Leiden University Medical Center; Leiden the Netherlands
8. Department of Immunology, Rheumatology and Allergy; Medical University of Lodz; Lodz Poland
9. Faculty of Medicine; Masaryk University; Brno Czech Republic
10. Réseau National de Surveillance Aérobiologique (R.N.S.A.); Brussieu France
11. Federal Office of Meteorology and Climatology Meteo Swiss; Zürich Switzerland
12. Local Health Authority; Milan Italy
13. Clinical Center of Allergology; University Hospital Sofia; Sofia Bulgaria
14. University of Ioannina; Ioannina Greece
15. Department of Ecology; Aristotle University of Thessaloniki; Thessaloniki Greece
16. Departamento de Biología Vegetal II; Facultad de Farmacia; Universidad Complutense de Madrid; Madrid Spain
17. Department of Pathophysiology and Allergy Research; Medical University Vienna; Vienna Austria
18. Departments of Experimental Immunology and Otorhinolaryngology; Academic Medical Center; University of Amsterdam; Amsterdam the Netherlands