“…Previously, different methods have been developed to detect and quantify tremor. For example, accelerometers [15], [16], [17], [18], [19], [20], [21], gyroscopes [22], and electromyography (EMG) [23], [24], [25] have been used extensively to obtain quantitative measurements of tremor. Despite of the difference of devices and systems, all of these methods are focusing on the tremor itself.…”