Distribution of non-motor symptoms in idiopathic Parkinson's disease and secondary Parkinsonism
BACKGROUND: Non-motor symptoms (NMS) are frequent in patients with idiopathic Parkinson's disease (IPD). Clinical expressions, postulated pathophysiological mechanisms, and responsiveness to antiparkinson medication represent differences between IPD and secondary Parkinsonism (SP).OBJECTIVE: To evaluate NMS expressions in IPD, SP, and a matched control group.METHODS: The accepted criteria for IPD