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India diarrhoea treatment 'could save millions of children'

5 July 2014 Last updated at 08:24 BST

Every year millions of children die from diarrhoea - but saving those lives should be easy - with a simple mixture of sugar, salt and water.

The BBC's Rahul Tandon has been to a clinic in the Indian city of Calcutta where medics are trying to make a difference.