1. Department of Biomedical and Clinical Sciences Luigi Sacco; University of Milan; Luigi Sacco Hospital Milan; Milan Italy
2. Department of Dermatology; Medical University of Graz; Graz Austria
3. Division of Rheumatology, Allergy and Immunology; Massachusetts General Hospital; Boston MA USA
4. Department of Otorhinolaryngology; Klinikum rechts der Isar; Technische Universität München; Munich Germany
5. Division of Immunology/Allergy Section; Department of Internal Medicine; University of Cincinnati College of Medicine; Cincinnati OH USA
6. Department of Dermatology; Johannes Gutenberg University; Mainz Germany
7. Department of Allergy; Hospital La Paz Institute for Health Research (IdiPaz); Biomedical Research Network on Rare Diseases-U754 (CIBERER); Madrid Spain
8. 3rd Department of Internal Medicine; National Angioedema Center; Semmelweis University; Budapest Hungary
9. Department of Clinical Medicine; Faculty of Medicine ABC; Sao Paulo Brazil
10. Medical University of South Carolina; Charleston SC
11. Division of Rheumatology, Allergy and Immunology; Department of Medicine; University of California - San Diego; La Jolla CA USA
12. Department of Medicine; University of Salerno; Salerno Italy