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Footnotes
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Contributors NH: substantial contributions to conception and design, and collection of data, and analysis and interpretation of data. Wrote original article and was involved in drafting the article revising it critically for important intellectual content; and give final approval of the version to be submitted and any revised version. EM, KJS, AJJ, JFM: substantial contributions to conception and design, and/or acquisition of data, and/or analysis and interpretation of data. Participated in revising the article critically for important intellectual content; and give final approval of the version to be submitted and any revised version.
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Funding This work was supported by the Department of Employment and Learning (DEL) Northern Ireland, grant number 08/NIR02/119.
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Competing interests None.
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Ethics approval Office for Research Ethics Committee Northern Ireland (ORECNI).
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Provenance and peer review Not commissioned; internally peer reviewed.