S. Leingprom, D. Charoenvidhya, B. Uerpairojkit, V. Phupong, and P. Samritpradit, “Cervical Swab Culture Results in Preterm Premature Rupture of Membranes (PPROM)”, Thai J Obstet Gynaecol, vol. 13, no. 4, pp. 207–211, Oct. 2001.