H. Al Shamma’a, “The association between abnormal vaginal microbial flora and preterm labor. Does a simple Gram’s stain of vaginal swab gives more useful data than culture ?”, JFacMedBagdad, vol. 56, no. 2, pp. 147–150, Jul. 2014, doi: 10.32007/jfacmedbagdad.562455.