Sakinah, B. I., Husada, D., & Sulistiawati, S. (2020). Risk Factors of Preterm Labor in RSUD Dr. M. Soewandhi Surabaya in 2017. Journal Of The Indonesian Medical Association, 69(12), 344-348. https://doi.org/10.47830/jinma-vol.69.12-2019-165