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  • Contributors JYB, SV and RH were involved in manuscript writing and critical revision of the 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 JYB: Consultant for Olympus America Inc. and Boston Scientific Corporation.SV: Consultant for Boston Scientific Corp., Olympus America Inc., Covidien and Creo Medical.RH: Consultant for Boston Scientific Corp., Olympus America Inc., Covidien, Creo Medical, Nine Points Medical and Cook Medical.

  • Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.

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