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

Natalia Yu. Malkova, chief researcher of the Department of complex hygienic assessment of the physical
factors, professor of hygiene conditions of education, training, labour and radiation hygiene department, Dr. of Sci. (Biol.), 4, 2^nd Sovetskaja st., St. Petersburg, Russia, 191036; 41, Kirochnaya str., St. Petersburg, Russia, 191015

S. V. Grebenkov
North-Western State Medical University named after I.I. Mechnikov
Russian Federation

41, Kirochnaya str., St. Petersburg, Russia, 191015

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

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