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Roper, Joanna C., Nirmala Amber, Osanna Yee Ki Wan, Abdul H. Sultan, und Ranee Thakar. "Review of Available National Guidelines for Obstetric Anal Sphincter Injury." Int Urogynecol J 2020.

Roper, Joanna C., et al. "Review of Available National Guidelines for Obstetric Anal Sphincter Injury." Int Urogynecol J 2020.