Parkinson's Symptoms/Tremor

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Tremor
Involuntary shaking, trembling or quivering movements of the muscles

The following references are relevant:-

Sanchez-Ramos et al (2011)  Quantitative Analysis of Tremors in Welders

Mure et al (2011)  Parkinson’s Disease Tremor-Related Metabolic Network: Characterization, Progression, and Treatment Effects 

Helmich et al (2012)  Cerebral causes and consequences of parkinsonian resting tremor: a tale of two circuits?