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Contributors NJS was responsible for the conception and design of the study and obtaining ethical approval. RS was responsible for the acquisition of the data. RS and NJS were responsible for the analysis and interpretation of the data, drafting and revision of the work up to the submitted version and agree to be accountable for all aspects of the work.
Competing interests None.
Ethics approval Health Education North West Research Committee.
Provenance and peer review Not commissioned; internally peer reviewed.
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