Sakinah, Bulqis Inas, Dominicus Husada, and Sulistiawati Sulistiawati. 2020. “Risk Factors of Preterm Labor in RSUD Dr. M. Soewandhi Surabaya in 2017”. Journal Of The Indonesian Medical Association 69 (12), 344-48. https://doi.org/10.47830/jinma-vol.69.12-2019-165.