Tondong, Henrietta Imelda, Sri Restu Tempali, Sri yanti Kusika, and Widya Pani. “Epidemiological Study of Maternal Risk Factors Influencing the Incidence of Preterm Birth in Developing Countries ”. Science Midwifery 13, no. 4 (October 4, 2025): 1042–1050. Accessed June 27, 2026. https://midwifery.iocspublisher.org/index.php/midwifery/article/view/2065.