1. Department of Dermatovenereology St. Petersburg State Pediatric Medical University 2A, Litovskaya Saint Petersburg 194100 Russian Federation
2. Department of dermatovenereology Medical Center XXI century 45, Bol'shoy Sampsonievsky prospect Saint‐Petersburg 194044 Russian Federation
3. Department of Pathomorphology I.I. Mechnikov North‐Western State Medical University 47, Piskarevsky prospect St. Petersburg 195067 Russian Federation
4. V.A. Rakhmanov Department of Skin and Venereal Diseases I.M. Sechenov First Moscow State Medical University 19c1, Bol'shaya Pirogovskaya Moscow 119146 Russian Federation
5. Department of dermatovenereology Republican Scientific and Practical Center of Sports Medicine 6, Almazar street Tashkent 100003 Uzbekistan
6. Department of dermatovenereology Tashkent Medical Academy 2, Ferobiy Tashkent 100109 Uzbekistan