title: [Problems of determining risk factors by using follow-up studies].
mesh_terms: D002648:Child; D005500:Follow-Up Studies; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D012306:Risk
vernacular_title: Zur Problematik der Bestimmung von Risikofaktoren durch Fall-Kontroll-Studien.