1. Institute of Clinical Physiology, National Research Council, 56124 Pisa, Italy
2. Uniti of Dermatologia, Specialist Surgery Area, Department of General Surgery, Livorno Hospital, Azienda Usl Toscana Nord Ovest, 57124 Livorno, Italy
3. Department of Health Sciences, Section of Pathological Anatomy, University of Florence, 50139 Florence, Italy