[Hygienic problems connected with education in relays of children in the 1st grade of elementary schools].
D002648:Child; D005260:Female; D006801:Humans; D007858:Learning; D007859:Learning Disabilities / Q000209:etiology; D008297:Male; D005222:Mental Fatigue / Q000150:complications; D011044:Poland; D012572:School Health Services; D013997:Time Factors
Problemy higieniczne zwia zane ze zmianowościa nauki u uczniów klas pierwsych