Bakri, Marwah M. “EVALUATION OF NON-INVASIVE DIAGNOSTIC TESTS FOR HELICOBACTER PYLORI INFECTION IN SYMPTOMATIC PATIENTS AND HEALTHY VOLUNTEERS”. Pakistan Journal of Physiology, vol. 8, no. 2, May 2018, pp. 10-12, https://pjp.pps.org.pk/index.php/PJP/article/view/780.