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Transthoracic echocardiography images. (A) Parasternal short-axis views (left, end-diastolic; right, end-systolic) show the preserved systolic function of the left ventricle before ruxolitinib treatment. (B) Parasternal short-axis views (left, end-diastolic; right, end-systolic) show the decreased systolic function of the left ventricle after ruxolitinib treatment.
