Loripour,M , , Najar Mohiabadi,M , , Allahbakhshi Nasab,P , and Sayadi,A . "Prevalence of third and fourth degree of perineal lacerations during vaginal delivery and some related factors in Nik Nafs maternity of Rafsanjan in 2015-2017", The Iranian Journal of Obstetrics, Gynecology and Infertility, 24, 6, 2021, 10-16. doi: 10.22038/ijogi.2021.18733