| http://www.w3.org/ns/prov#value | - back; placed on same horizontal line as V4 to V6; lead V7 is placed on the posterior axillary line, V8-angle of the scapula (posterior scapular line); lead V9-over the left border of spine [p47] ??? ??? ??? modified chest leads (MCL) bipolar chest leads that are variations of the unipolar chest leads; each MCL consists of a + and - electrode applied to a specific location on the chest; accuracy i
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