[Group mechanical time-keeping as a method of the hygienic characterization of trainees' work].
D000293:Adolescent; D006801:Humans; D009031:Moscow; D009787:Occupational Medicine; D009934:Organization and Administration
Gruppovoĭ mekhanokhronometrazh kak metod gigienicheskoĭ kharakteristiki raboty uchashchikhsia.