[1
]
Policlinic for Dermatology and Venereology, Saint Kliment Ohridski University, University
Hospital Lozenetz, Koziak street 1, Sofia, Bulgaria.
[2
]
"Onkoderma"-Policlinic for Dermatology and Dermatologic Surgery, General Skobelev
26 blvd., Sofia, Bulgaria.
[3
]
Department of Dermatology and Allergology, Academic Teaching Hospital Dresden-Friedrichstadt,
Dresden, Germany.
[4
]
University of Rome "G. Marconi", Rome, Italy.