COMT and Cognitive impairment: Here, we investigated whether genetic variation within COMT influences PD risk, LID, cognitive impairment, motor function, and complications, using array‐based genotyping and whole‐genome sequencing (WGS) data from the Global Parkinson's Genetics Program (GP2)12 and the Accelerating Medicines Partnership‐Parkinson Disease (AMP‐PD) initiatives.