Zaman, Uzma, Alruba taimoor, Sadaf Anwar Qureshi, Inayat Shah, Aamir Nazir, and Sadia Fatima. 2019. “Common Risk Factors of Spontaneous Preterm Labor With Intact Fetal Membranes”. Pakistan Journal of Physiology 15 (3):10-12. https://pjp.pps.org.pk/index.php/PJP/article/view/1045.