Footnotes

• Contributors KCD, RLF and DM are joint first authors. DM and AM designed the study and methodology. KCD, RLF, MC and DM conducted the survey. KCD, RLF and DM analysed the data. All authors wrote, edited or approved the final submitted report. DM is the guarantor.

• Competing interests None.

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

• Data sharing statement The corresponding author DM is happy to provide copies of the survey data in anonymised form to interested parties.