[1] Trakia Univ, Univ Hosp, Fac Med, Dermatol & Venereol, Stara Zagora, Bulgaria
[2] Trakia Univ, Fac Med, Dept Med Rehabil & Occupat Therapy, Phys Med & Sports, Stara Zagora, Bulgaria
[3] Vivantes Kilnikum Neukolln Reg South, Dept Dermatol & Venereol, Berlin, Germany