Malik, Javeria, Usama Atiq, Muhammad Hassan Naveed, Shaaf Ahmad, Husna Ahmad, and Nabila Roohi. “Causes and Consequences of Preterm Birth, A Systematic Review: Causes and Consequences of PTB”. Pakistan Journal of Health Sciences 3, no. 07 (December 31, 2022): 230–239. Accessed April 28, 2024. https://thejas.com.pk/index.php/pjhs/article/view/193.