Footnotes

• Contributors RG and PM: planning, conduct and reporting of the work, writing the manuscript, drafting, editing, revising, final approval and literature search; guarantor. AM, VS and KM: planning, conduct and reporting of the work, drafting, editing, revising and final approval; guarantor. HK: planning, conduct and reporting of the work; guarantor.

• Competing interests None declared.

• Patient consent Obtained.

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