Footnotes

• Contributors AMK–planning, drafting and critical revision of manuscript. WGS–planning and critical revision of manuscript. Both authors are responsible for the overall content 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 WGS has received speaking honoria from Boston Scientific and Abbott Medical and is co-holder of a patent for needle ablation that is consigned to Brigham Hospital.

• Patient consent Not required.

• Provenance and peer review Commissioned; externally peer reviewed.

• Author note References which include a * are considered to be key references.