Bibliographical noteFunding Information:
We are indebted to all the participating subjects. V.B. acknowledges the financial support from the Stichting ParkinsonFonds (the Netherlands) to his research on Genetics of Movement Disorders (grant number: SPF‐1870).
V.B. receives research grants from the Stichting ParkinsonFonds and from Alzheimer Nederland (the Netherlands) and honoraria from Elsevier Ltd, as co‐editor in chief of Parkinsonism & Related Disorders; and from the International Parkinson and Movement Disorder Society, as chair of the Congress Scientific Program Committee 2019–2021. The other authors have nothing to declare. D.J.S.K., C.F., S.A., S.H.R., G.J.B., K.S. no financial disclosures or conflicts of interest related to this research. no financial disclosures for the past 12 months regardless of relationship to this research.