Chankhem, S., and W. Chirdchim. “Depletion of Vaginal Lactobacilli and Risk of Preterm Birth in Pregnant Women Delivered at Prapokklao Hospital”. Thai Journal of Obstetrics and Gynaecology, vol. 31, no. 2, Mar. 2023, pp. 107-14, doi:10.14456/tjog.2023.13.