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Farooq N, Roghani P, Afza N, Saleem A, Farooq A. Frequency of Obstetrical Anal Sphincter Injuries in Nulliparous Women Undergoing Normal Vaginal Delivery in Tertiary Care Hospital at Khyber Pakhtunkhwa: OASI in Nulliparous Women Undergoing Normal Vaginal Delivery . PJHS-Lahore [Internet]. 2025 Mar. 31 [cited 2025 Apr. 24];6(3):241-5. Available from: https://thejas.com.pk/index.php/pjhs/article/view/2756