1 Department of Dermatology, Medical University-Sofia, Sofia, Bulgaria. Electronic address: kosara@lycos.com.
2 Department of Dermatology, Medical University-Sofia, Sofia, Bulgaria.
3 Department of Dermatology, Rutgers-New Jersey Medical School, Newark, New Jersey, USA; Department of Pathology, Immunology and Laboratory Medicine, Rutgers-New Jersey Medical School, Newark, New Jersey, USA.