The Frequency of Nonmotor Symptoms among Advanced Parkinson Patients May Depend on Instrument Used for Assessment by Nelson Hwynn, Ihtsham U. Haq, Irene A. Malaty, Andrew S. Resnick, Michael S. Okun, Danica S. Carew, Genko Oyama, Yunfeng Dai, Samuel S. Wu, Ramon L. Rodriguez, Charles E. Jacobson, Hubert H. Fernandez

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