sensors Article A Waist-Worn Inertial Measurement Unit for Long- Term Monitoring of Parkinson's Disease Patients Daniel Rodríguez-Martín 1,*,†, Carlos Pérez-López 1,†, Albert Samà 1, Andreu Català 1, Joan Manuel Moreno Arostegui 1, Joan Cabestany 1, Berta Mestre 2, Sheila Alcaine ...