Footnotes

• Twitter Follow Primiano Iannone at @primianoiannone

• Contributors PI is responsible for conception and design of the work, stewardship of the discussion among the authors, deep analysis of all of the literature considered and of contributes of the authors; draft of the manuscript. NM, MM and AC are responsible for substantial contributions the acquisition, analysis of the relevant literature, interpretation of data and of critical appraisal the literature; revision of the manuscript for intellectual content; final approval of the version submitted. JD and PC are responsible for substantial contributions to the analysis interpretation of relevant literature considered, focused assessment of factors influencing guideline trustworthiness; critical revision of the manuscript for important intellectual content. Final approval of the version submitted. All of the authors agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

• Competing interests None declared.

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