1. Department of Medicine II University Hospital Klinikum rechts der Isar Technische Universität München Munich Germany
2. Division of Allergy, Immunology and Infectious Diseases Department of Dermatology Medical University of Vienna Vienna Austria
3. Department of Medicine I University Hospital Bonn Bonn Germany
4. Praxis Jessen2 + Kollegen, Private Practice Berlin Germany
5. ICH Hamburg, Private Practice Hamburg Germany