1. Division of Allergology; Paul-Ehrlich-Institut; Langen Germany
2. Department of Biopolymers; University of Bayreuth; Bayreuth Germany
3. Centre for Dermatology and Allergology; Kantonsspital Luzern; Luzern Switzerland
4. Department of Dermatology; University Hospital Zurich; Zurich Switzerland
5. Allergy and Asthma Center Westend; Berlin Germany
6. Department of Dermatology, Venereology and Allergology; University of Leipzig; Leipzig Germany