1. Istituti Ospedalieri Bergamaschi, Policlinico San Marco, Devision of Dermatology Zingonia‐Osio Sotto (Bg) Italy
2. Surgical department, UOC Dermatologia, ASST Papa Giovanni XXIII Bergamo Italy
3. Department of Medical Sciences, Section of DermatologyUniversity of Ferrara Ferrara Italy