Footnotes

• Twitter @DrAlfonsoFasano

• Contributors MCSS: research project execution and writing of the first draft of the manuscript. AF: research project conception and organisation; review and critique of the manuscript.

• Funding AF received honoraria for consultancies from Abbvie, Abbott, BrainLab, Boston Scientific, Chiesi farmaceutici, Ipsen, Medtronic, Sunovion and UCB; honaria for participation in advisory boards from Abbvie, Boston Scientific and Ipsen; research grants from Abbvie, Boston Scientific, Cummings Foundation, Dystonia Medical Research Foundation Canada, Michael J. Fox Foundation, Medtronic, University of Toronto and Weston Foundation.

• Competing interests AF received honoraria and research support from Abbott, Boston Scientific and Medtronic.

• Patient consent for publication Not required.

• Provenance and peer review Commissioned; internally peer reviewed.