Footnotes

• Contributors KT contributed to data collection and wrote the first manuscript draft. BM contributed to data collection and obtained patient consent. AM contributed to concept and data collection and is the guarantor. All authors edited and approved the final version of manuscript.

• 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.

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