1. Allergy Unit; Department of Dermatology; University Hospital; Zürich Switzerland
2. Department of Dermatology and Allergy Biederstein; Technische Universität München; Munich Germany
3. Pediatric Hospital Bambino Gesù; Vatican City Italy
4. Paul-Ehrlich-Institut; Langen Germany
5. Christine Kühne Center for Allergy Research and Education CK-CARE; Hochgebirgsklinik; Davos Switzerland
6. Department of Pediatrics; Medical University of Vienna; Vienna Austria
7. Nestlé Research Center; Lausanne Switzerland