M. D.- ul Islam, S. H. Rahman, S. Shamsuzzaman, N. Muazzaman, N. Ahmed, and S. Nahar, “Urine-Based ELISA for the Detection of Helicobacter pylori IgG Antibody and Comparison with Other Invasive Methods”., Bangladesh J Med Microbiol, vol. 4, no. 1, pp. 14–17, Aug. 2011.