title: [Hygienic effects of frequently playrooms on 1st grade pupils in elementary schools].
mesh_terms: D002648:Child; D005260:Female; D006128:Growth; D006801:Humans; D008297:Male; D010988:Play and Playthings; D012063:Relaxation; D012572:School Health Services / Q000592:standards; D012737:Sex Factors
vernacular_title: Higieniczno-zdrowotne aspekty pobytu w świetlicy uczniów klas pierwszych