Kleebsuwan, Jiratchaya, Chanya Thamrongwuttikul, and Watcharin Chirdchim. 2019. “Comparison of Vaginal pH between Bacterial Vaginosis and Non-bacterial Vaginosis in Preterm Labour”. Thai Journal of Obstetrics and Gynaecology 27 (1). Bangkok, Thailand:6-12. https://doi.org/10.14456/tjog.2019.2.