S. V. Greben’kov
North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Sergey V. Greben’kov

41, Kirochnaya str., St. Petersburg, 191015

O. A. Kochetova
North-Western State Medical University named after I.I. Mechnikov; North-West Public Health Research Center
Russian Federation

Olga A. Kochetova, neurologist-occupational pathologist of the North-Western Scientific Center of Hygiene and Public Health of Rospotrebnadzor; post-graduate student of the department of labor medicine of the North-Western State Medical University named after I.I. Mechnikov of the Ministry of Health of Russia

41, Kirochnaya str., St. Petersburg, 191015
4, 2^nd Sovetskaja str., St. Petersburg, 191036 

N. Yu. Mal’kova
North-Western State Medical University named after I.I. Mechnikov; North-West Public Health Research Center
Russian Federation

Natalia Yu. Mal’kova

41, Kirochnaya str., St. Petersburg, 191015
4, 2^nd Sovetskaja str., St. Petersburg, 191036 

E. V. Milutka
North-Western State Medical University named after I.I. Mechnikov
Russian Federation

Elena V. Milutka

41, Kirochnaya str., St. Petersburg, 191015