Islam, Md Din-ul, et al. “Urine-Based ELISA for the Detection of Helicobacter Pylori IgG Antibody and Comparison With Other Invasive Methods”. Bangladesh Journal of Medical Microbiology, vol. 4, no. 1, Aug. 2011, pp. 14-17, doi:10.3329/bjmm.v4i1.8463.