1 Dermatology and Skin Cancer Unit, 1st Medical Department, Arcispedale Santa Maria Nuova, IRCCS, Reggio Emilia, Italy.
2 Department of Medical and Surgical Sciences and Biotechnologies, Division of Dermatology "Daniele Innocenzi," Sapienza University of Rome, Polo Pontino, Italy.
3 Dermatology Unit, University of Sassari, Sassari, Italy.
4 Dermatology Unit, Second University of Naples, Naples, Italy. Electronic address: g.argenziano@gmail.com.