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  1. Jonathan Wyatt1,
  2. Liza Keating2
  1. 1Department of Accident and Emergency, Royal Cornwall Hospital, Treliske, Truro, Cornwall, TR1 3LJ, UK
  2. 2Department of Accident and Emergency, Oxford, UK
  1. Correspondence to:
 Department of Accident and Emergency, Royal Cornwall Hospital, Treliske, Truro, Cornwall TR1 3LJ, UK;

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