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SMI score for the MN. (A) 0 score, no blood flow detected within MN; (B) 1 score, 2 spot blood flow within MN; (C) 2 score, more than 2 spot blood flow within MN; (D) 3 score, more than 2 strip blood flow within MN. MN = median nerve, SMI = superb microvascular imaging.
