| http://www.w3.org/ns/prov#value | - a substrate; a plurality of at least three electrodes coupled to the substrate, the plurality of electrodes including up to six electrodes capable of measuring the electrical activity of the left side of the patient's heart, up to four limb electrodes, and up to three electrodes capable of measuring the electrical activity of the right side of the patient's heart, the plurality of electrodes acqui
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