Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
Contributors LT: draft and revision of manuscript. NJH: study design, revision of manuscript and final approval. DMB, DTH, MD: data collection, revision of manuscript and final approval. DW: study design, data collection, draft and revision of manuscript and final approval.
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 None declared.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; externally peer reviewed.