Footnotes

• Contributors RG designed the study, administered the questionnaire, analysed the results and wrote the initial drafts of the manuscript. NJH was involved in the initial study design, data analysis and manuscript writing. MS supervised the study, helped in the study design, data analysis and manuscript writing.

• Competing interests None.

• Ethics approval Research and Development Department, University Hospital Southampton.

• Provenance and peer review Not commissioned; externally peer reviewed.