B.N. Levitan, Т.R. Kasyanova, Yu.B. Titarenko, I.Y. Petelina, M.A. Voznyuk Astrakhan State Medical University, 121 Bakinskaya Str., 414000 Astrakhan, Russian Federation  Levitan B.N. – Doc. Med. Sc., Professor, Head of the Department of Faculty Therapy and Occupational Diseases with a course of post-graduate education, e-mail: bolev@mail.ru Kasyanova T.R. – Doc. Med. Sc., Associate Professor of […]