1. Medizinische Universität Wien; Universitätsklinik für Hals, Nasen und Ohrenkrankheiten; Wien; Austria
2. Informatics Systems & Applications Group; Department of Mechanical Engineering; Aristotle University; Thessaloniki; Greece
3. Finnish Meteorological Institute; Air Quality Research; Helsinki; Finland
4. Department of Dermatology and Allergy; Charité-Universitätsmedizin; Berlin; Germany, a member of GA2LEN