Constipation/complications; Defecation; Pelvic Floor/physiopathology; Rectal Prolapse/surgery; Rectocele/surgery; Rectum/surgery; Adolescent; Adult; Aged; Aged, 80 and over; Biofeedback, Psychology; Chronic Disease; Constipation/therapy; Defecation/physiology; Defecography; Diagnosis, Differential; Diverticulitis/complications; Female; Follow-Up Studies; Gastrointestinal Motility; Hernia/diagnosis; Humans; Laparoscopy; Male; Middle Aged; Patient Satisfaction; Patient Selection; Rectal Prolapse/diagnosis; Rectocele/diagnosis; Retrospective Studies; Sensitivity and Specificity; Surgical Staplers; Time Factors