[Methods of material collection for retrospective evaluation of morbidity of neoplastic diseases in children].
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D008499:Medical Records; D009369:Neoplasms / Q000453:epidemiology*; D011044:Poland; D012189:Retrospective Studies
Metody zbierania materiału, dotyczacego retrospektywnej ocney zachorowalności dzieci na chorobe nowotworowa.