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Financial & competing interests disclosure
Manjit S Matharu serves on the advisory board for Allergan, and has received payment for the development of educational presentations from Allergan, Merck Sharpe & Dohme and Medtronic. Ludvic Zrinzo occasionally receives honoraria and travel costs for educational activities from the manufacturer of DBS hardware. This work was undertaken at University College London/University College London Hospitals and was funded in part by the Department of Health NIHR Biomedical Research Centres funding scheme. The Unit of Functional Neurosurgery, UCL Institute of Neurology, Queen Square, London is supported by the Parkinson’s Appeal. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
No writing assistance was utilized in the production of this manuscript.