1 Department of Mechanical Engineering, Environmental Informatics Research Group, Aristotle University, Thessaloniki, Greece.
2 Aerobiology and Pollen Information Research Unit, Department of Oto-Rhino-Laryngology, Medical University of Vienna, Vienna, Austria.
3 Foundation German Pollen Information Service, Berlin, Germany.
4 Department of Otorhinolaryngology, Head and Neck Surgery, Universitätsmedizin Mannheim, Medical Faculty Mannheim, Heidelberg University, Mannheim, Germany.
5 Center for Rhinology and Allergology, Wiesbaden, Germany.