1. Division of Dermatology; Department of Specialized; Experimental and Diagnostic Medicine; S. Orsola-Malpighi Hospital; University of Bologna; Bologna Italy
2. Department of Health Sciences; University of Florence and Department of Paediatric Medicine; Anna Meyer Children's University Hospital; Florence Italy
3. Department of Histopathology and Transplantation Pathology; S. Orsola-Malpighi Hospital; University of Bologna; Bologna Italy