1 Department of Dermatology, Hospital of Ravenna, Ravenna, Italy.
2 Department of Medical Sciences, Section of Dermatology and Infectious Diseases, University of Ferrara, Ferrara, Italy.
3 Department of Operative Unit of Pathologic Anatomy, Santa Maria delle Croci Hospital, AUSL della Romagna, Ravenna, Italy.
4 Department of Dermatology, Scientific Institute for Research, Hospitalization and Healthcare (IRCCS), University Hospital of Bologna, Bologna, Italy.
5 Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, Bologna, Italy.