Parkinson Platform Noord Nederland

We thank The Lancet Neurology for highlighting the changes in Parkinson's disease diagnosis given in the new International Parkinson Disease and Movement Disorder Society diagnostic criteria.1 The criteria were created in response to the huge advances in our understanding of Parkinson's disease over the past 20 years, especially the identification of α-synuclein, advances in genetics, recognition of non-motor Parkinson's disease, and the realisation that prodromal stages exist. The Movement Disorder Society recognised that these advances challenge the fundamental definition of Parkinson's disease and created a task force to examine potential changes to the Parkinson's disease definition,1 develop revised diagnostic criteria,2 and develop research criteria for prodromal Parkinson's disease.