A. Ya. Ilkanich
Surgut State University
Russian Federation

Andrey Ya. Ilkanich, doctor of medical sciences

628412, Surgut, Lenin str., 1 

V. V. Darvin
Surgut State University
Russian Federation

Vladimir V. Darvin, doctor of medical sciences, professor

628412, Surgut, Lenin str., 1 

M. G. Ryzhikov
Nizhnevartovsk District Clinical Hospital
Russian Federation

Mikhail G. Ryzhikov

628412, Nizhnevartovsk, Lenin str., 18

A. V. Oganian
Nizhnevartovsk District Clinical Hospital
Russian Federation

Armen V. Oganian

628412, Nizhnevartovsk, Lenin str., 18