E.S. Olenko1, E.V. Fomina2, V. F. Kirichuk3, A. I. Kodochigova4, V.D. Yupatov5

1 Saratov National Research State University named after N.G. Chernyshevsky (Saratov, Russia)

2–5 Saratov State Medical University named after V. I. Razumovsky (Saratov, Russia)