A novel three-dimensional dynamic anorectal ultrasonography technique for the assessment of perineal descent, compared with defaecography von Murad-Regadas, S. M., dos Santos, D., Soares, G., Regadas, F. S. P., Rodrigues, L. V., Buchen, G., Kenmoti, V. T., Surimã, W. S., Fernandes, G. O. da S.

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