Assertion: tremor | /r/CapableOf | start in the head
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Source sentences:
text: Alexander Rajput, MD, of the University of Saskatchewan in Canada, in describing a cross section of his patients with ET, notes that about 75% of patients have tremor that originates in an upper extremity; 20% have tremor that starts in an upper extremity and the head, lips, jaw, or vocal cords; and 5% have tremor limited to the head