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Helicobacter pylori infection rates in relation to age and social class in a population of Welsh men.
  1. F Sitas,
  2. D Forman,
  3. J W Yarnell,
  4. M L Burr,
  5. P C Elwood,
  6. S Pedley,
  7. K J Marks
  1. Imperial Cancer Research Fund, Radcliffe Infirmary, Oxford.

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