[20 years of voluntary serial radiography in the province of Nordrhein].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D005260:Female; D005860:Germany, West; D049673:History, 20th Century; D006801:Humans; D008297:Male; D008400:Mass Chest X-Ray / Q000266:history*; D008875:Middle Aged; D012189:Retrospective Studies; D012737:Sex Factors; D014397:Tuberculosis, Pulmonary / Q000453:epidemiology
20 Jahre Röntgenreihenuntersuchung im Landesteil Nordrhein auf freiwilliger Basis.