E.F. MANNANOVA1, S.V. KHALIULLINA1, 2, E.M. POKROVSKAYA1,2, T.YU. PAVLOVA3  1Kazan Federal University, Kazan 2Kazan State Medical University, Kazan 3Republican Clinical Infectious Hospital named after Prof. A.F. Agafonov, Kazan  Contact details: Mannanova E.F. — Lecturer of the Department of Otolaryngology and Ophthalmology Address: 76 Karl Marx St., Kazan, Russian Federation, 420012, tel.: +7 (843) 236-76-40, e-mail: elmman82@mail.ru The leading cause of […]