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JVL is funded by a Research Training Fellowship from Action Medical Research, The Gay-Ramsay-Steel-Maitland or Stafford Trust and the Hazel M Wood Charitable Trust; RKR was funded by a University of Edinburgh Medical Faculty Fellowship and ERN is supported by a Wellcome Trust Programme Grant (072789/Z/03/Z). Financial assistance was also provided by Schering-Plough and the GI/Nutrition Research Fund, Child Life and Health, University of Edinburgh.
Competing interests: None.
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