I.V. Zhitareva - Ph. D. (Med.), Associate Professor, The Russian Research Medical University named after N.I. Pirogov (Moscow). E- mail: irina.zhitareva@mail.ru M.E. Timofeev - Ph. D. (Med.), Leading Research Scientist, The Russian Research Medical University named after N.I. Pirogov (Moscow) K.I. Golets - Student, The Russian Research Medical University named after N.I. Pirogov (Moscow) A.A. Ablkaramova - Student, The Russian Research Medical University named after N.I. Pirogov (Moscow) S.V. Leshukov - Ph. D. (Phis.-Math.), Associate Professor, The Russian Research Medical University named after N.I. Pirogov (Moscow)