Naz, Farhat, et al. “FREQUENCY OF SEROPOSITIVITY OF HELICOBACTER PYLORI IN PATIENTS PRESENTING WITH DYSPEPSIA”. Journal of Ayub Medical College Abbottabad, vol. 25, no. 3-4, July 2013, pp. 50-54, https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/1694.