J. F. Mehrabadi, M. Sirous, N. E. Daryani, S. Eshraghi, B. Akbari, and M. H. Shirazi, “Assessing the role of the RND efflux pump in metronidazole resistance of Helicobacter pylori by RT-PCR assay”, J Infect Dev Ctries, vol. 5, no. 02, pp. 88–93, Oct. 2010.