[1] Trakia Univ, Fac Med, Sect Pharmacol & Clin Pharmacol, 11 Armeiska St, Stara Zagora 6000, Bulgaria
[2] UMHAT Prof Dr Stoyan Kirkovich AD, Clin Dermatol & Venereol, Stara Zagora, Bulgaria
[3] Trakia Univ, Fac Med, Sect Dermatovenereol, Stara Zagora, Bulgaria