M. A. Livzan
Omsk state medical University, Ministry of health of the Russian Federation
Russian Federation

Mariya A. Livzan, doctor of medical sciences, professor, rector, head of the department of faculty therapy, occupational
diseases, 12 Lenina str., Omsk, 644099, Russia

D. S. Gylka
Omsk state medical University, Ministry of health of the Russian Federation
Russian Federation

Darya S. Gylka, clinical resident of the department of faculty therapy, occupational diseases, 12 Lenina str., Omsk, 644099, Russia

Yu. P. Skirdenko
Omsk state medical University, Ministry of health of the Russian Federation
Russian Federation

Yuliya P. Skirdenko, cand. of med. sci, assistant of the Department of faculty therapy, occupational diseases, 12 Lenina str., Omsk, 644099, Russia

N. A. Nikolaev
Omsk state medical University, Ministry of health of the Russian Federation
Russian Federation

Nikolaj A. Nikolaev, doctor of medical sciences, associate professor, vice-rector for medical activity and regional health care, professor of the department of faculty therapy, occupational diseases, 12 Lenina str., Omsk, 644099, Russia

O. A. Ratnikova
City hospital № 17
Russian Federation

Olga A. Ratnikova, doctor-gastroenterologist, 644046, Russia, Omsk, prospect Kosmicheskiy, 99