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Contributors FÇT: Concept and design and data collection, revision and approval of article; NHA: data collection, critical revision of article; NZ: data collection from patient.
Competing interests None.
Patient consent Obtained.
Ethics approval Abdomen.
Provenance and peer review Not commissioned; internally peer reviewed.
▸ Additional material is published online. To view please visit the journal (http://dx.doi.org/10.1136/emermed-2014-203818).
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