Nguyen, Quoc Huy Vu, et al. “Lower Genital Tract Infections in Preterm Premature Rupture of Membranes and Preterm Labor: A Case-Control Study from Vietnam”. The Journal of Infection in Developing Countries, vol. 15, no. 06, June 2021, pp. 805-11, doi:10.3855/jidc.13244.