1. Department of Experimental, Diagnostic and Specialty Medicine (DIMES) University of Bologna Bologna Italy
2. Dermatology Unit IRCCS of Azienda Ospedaliero‐Universitaria Policlinico Sant'Orsola Hospital Bologna Italy
3. Pathology Unit Ospedale Maggiore Bologna Italy
4. Pathology Unit S.Orsola Malpighi Hospital Bologna University Bologna Italy