16 July 2012
Last updated at 13:12
By Susan Watts
Newsnight science editor, BBC News
About a third of 50- to 70-years-olds carry the bacterium Helicobacter pylori
A mass-screening programme for 50- to 70-year-olds could cut the risk of stomach bleeds due to daily doses of aspirin, cancer experts have said.
About a third of this
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