Zaman U, taimoor A, Qureshi SA, Shah I, Nazir A, Fatima S. Common risk factors of spontaneous preterm labor with intact fetal membranes. Pak J Phsyiol [Internet]. 2019 Sep. 1 [cited 2024 Apr. 25];15(3):10-2. Available from: https://pjp.pps.org.pk/index.php/PJP/article/view/1045