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(a) relapse analysis of experimental and control groups. (b) ultrasonic tissue thickness comparison between the two groups measured at 6-month post-brachytherapy or before (relapsed). (c) ultrasonic elastic modulus comparison between the two groups measured at 6-month post-brachytherapy or before (relapsed). **p < 0.01; ***p < 0.001; ****p < 0.0001.
