Use of dynamic 3-dimensional transvaginal and transrectal ultrasonography to assess posterior pelvic floor dysfunction related to obstructed defecation. - Murad-Regadas SM; Regadas Filho FS; Regadas FS; Rodrigues LV; de J R Pereira J; da S Fernandes GO; Dealcanfreitas ID; Mendonca Filho JJ (Diseases of the colon and rectum, 2014)