1. Dermatology Unit; Department of Surgical, Microsurgical and Medical Sciences; University of Sassari; Sassari Italy
2. Dermatology Unit; Academic Department of Pediatrics; Children's Hospital Bambino Gesù -IRCCS; Rome Italy
3. Unit of Immune and Infectious Diseases; Academic Department of Pediatrics; Children's Hospital Bambino Gesù; Rome Italy
4. Department of Pediatrics; University of Modena and Reggio Emilia; Modena Italy