title: [Changes in body weight in elementary school children in the first and second grades].
mesh_terms: D000886:Anthropometry; D001835:Body Weight; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D011044:Poland; D012737:Sex Factors
vernacular_title: Zmiany dynamiki przyrostów masy ciała w pierwszym i drugim roku nauki w szkole podstawowej.