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(a–d) Plots of the mean displacement amplitudes from the five driver setups for the long- and short-axis slices (a,b and c,d, respectively) of the heart at end-systole and end-diastole (a,c and b,d, respectively). Error bars show ±1 standard deviation. “*” indicates the significant differences (P<0.05) between the direct contact setup and other driver setups and “+” indicates the significant differences (P<0.05) between the suture setup and other driver setups.
