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Correction notice This article has been correcetd since it first published online. The sentence starting ‘We tested two additional response options’ has been corrected.
Contributors Conceptualisation: GB, JAH, JS. Design of data collection: GB, EMN, ZBG, JS, JAH. Data collection: EMN, JAH. Analysis: GB, EN. Writing and review of the manuscript: GB, EMN, ZBG, JS, JAH. Approval of the final manuscript: GB, EMN, ZBG, JS, JAH.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests No, there are no competing interests for any author.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.