L.R. GAYSINA¹, R.SH. VAKHITOVA2, A.I. SAMIGULLINA¹, A.A. ABAKUMOVA2  1Kazan (Volga Region) Federal University, Kazan 2Healthcare unit of the Kazan (Volga Region) Federal University, Kazan  Contact details: Gaysina L.R. — PhD (mediсine), Associate Professor of the Department of Internal Medicine Address: 18 Kremlevskaya St., Kazan, Russian Federation, 420008, tel.: +7-903-307-92-47, e-mail: leilag@inbox.ru The article presents a clinical […]