1. Department of Dermatology; Hospital del Mar; Universitat Autònoma de Barcelona; Barcelona Spain
2. Norfolk & Norwich University Hospital and St John's Institute of Dermatology; Norwich UK
3. Department of Dermatology and Allergy; Allergie-Centrum-Charité; Charité - Universitätsmedizin Berlin; Berlin Germany
4. Division of Allergy and Clinical Immunology; Bnai-Zion Medical Centre; Haifa Israel