1. Saratov State University, Saratov 410012, Russia
2. Saratov State Medical University, Saratov 410012, Russia
3. Clinic of Skin and Venereal Diseases, Saratov 410028, Russia
4. Skolkovo Institute of Science and Technology, Moscow 143026, Russia
5. Tomsk State University, Tomsk 634050, Russia
6. Queen Mary University of London, London E1 4NS, U.K.