Bollard, R. C., Gardiner, A., Duthie, G. S., & Lindow, S. W. (2003). Anal sphincter injury, fecal and urinary incontinence: a 34-year follow-up after forceps delivery. Diseases of the colon & rectum, 46(8), 1083-1088. https://doi.org/10.1007/s10350-004-7284-8