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Comparative mRNA expression of PGC-1α in blood samples and myocardial biopsy specimens
Patients were divided according to the cut-off value of 2-fold PGC-1α expression in blood samples (i.e., patients with a significant higher expression: >2-fold expression and patients without detectable PGC-1α expression: <2-fold expression). Kappa index was used as measure of agreement between both determinations
