Financial & competing interests disclosure
This work was supported by research grants of the Netherlands Organization for Scientific Research (VIDI grants to Marcel Verbeek and Bastiaan R Bloem), the Stichting Internationaal Parkinson Fonds and the Alkemade Keuls fonds. 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.