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Is a prior 3RD or 4th degree perineal laceration a risk fac..:

Payne, T. ; Rayburn, W. ; Carey, J.
American Journal of Obstetrics and Gynecology.  176 (1997)  1 - p. S139 , 1997
Link: https://doi.org/10.1016/s0002-9378(97)80546-7