Wahyudi, S. D., Yeni, C. M., Utami, N. A., Hasanuddin, H., Septivera, Y., & Yani, M. (2026). Association and predictive performance of platelet-to-lymphocyte ratio and maternal serum ferritin level for preterm birth: A prospective cohort study. Narra J, 6(2), e3131. https://doi.org/10.52225/narra.v6i2.3131