1. Department of Dermatology, Venereology and Allergy & Allergy Center Mainfranken University Hospital Würzburg Würzburg Germany
2. Department of Dermatology and Venereology Medical University of Graz Graz Austria
3. Outpatient Allergy Clinic Reumannplatz Vienna Austria
4. Allergy Unit and Multidisciplinary Mastocytosis Outpatient Clinic Azienda Ospedaliera Universitaria Integrata of Verona Verona Italy
5. Department of Allergology & GRIAC Research Institute University of Groningen, University Medical Center Groningen Groningen The Netherlands