1. Dermatology Unit, Azienda Unità Sanitaria Locale-IRCCS di Reggio Emilia, 42122 Reggio nell’Emilia, Italy
2. Department of Internal Medicine, University of Genova, 16132 Genova, Italy
3. Department of Internal Medicine, Ospedale Policlinico San Martino, 16132 Genova, Italy
4. Department of Emergency and Organ Transplantation, School of Allergology and Clinical Immunology, University of Bari Aldo Moro, Policlinico di Bari, 70124 Bari, Italy
5. Department of Clinical and Experimental Medicine, School and Division of Allergy and Clinical Immunology, University of Messina, 98125 Messina, Italy