1 Department of Emergency and Organ Transplantation, School and Chair of Allergology and Clinical Immunology, University of Bari - Aldo Moro, Bari, Italy.
2 Medical Sciences Department, Dermatologic Clinic, University of Turin, Turin, Italy.
3 Dermatology, University of Modena and Reggio Emilia, Modena, Italy.
4 Department of Biomedical Science and Human Oncology, Dermatological Clinic, University of Bari, Italy.
5 Section of Allergy and Clinical Immunology, Unit of Internal Medicine-"F. Miulli" Hospital, Acquaviva delle Fonti, (BA), Italy.
6 Unit of Dermatology, Department of Health Sciences, University Magna Graecia of Catanzaro, Catanzaro, Italy.
7 Unit of Dermatology, Department of Medical Sciences and Public Health, University of Cagliari, Italy.
8 Dermatology Unit, University of Campania, Naples, Italy.
9 UOC Dermatologia, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy Dipartimento di Fisiopatologia Medico-Chirurgica e dei Trapianti, Università degli Studi di Milano, Milan, Italy.
10 Department of Health Sciences "Vincenzo Tiberio", University of Molise, Campobasso, Italy.
11 Allergology Service, AUSL Modena, Italy.
12 Department of Internal Medicine and Clinical Pathology, Azienda Ospedaliera Universitaria Federico II, Naples, Italy.
13 National Institute of Statistics (ISTAT), Bari, Italy.
14 Section of Dermatology, Department of Clinical Medicine and Surgery, University of Naples Federico II, Naples, Italy.