1 German Pollen Information Service Foundation, Berlin, Germany.
2 ZAUM-Center of Allergy & Environment, Technical University Munich, Munich, Germany.
3 Environmental Informatics Research Group, Department of Mechanical Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece.
4 Department of Otorhinolaryngology, Head and Neck Surgery, Section of Rhinology and Allergy, University Hospital Marburg, Philipps-Universität Marburg, Marburg, Germany.