Statistical analysis: Base line characteristics will be compared between case and control group using Chi-square o Fisher Test for categorical variable, and for continuing variables, the Mann-Whitney Test will be used. The sensitivity, specificity, and predictive values of the endoscopic findings for normal gastric mucosa, H. pylori infection, and gastric atrophy will be calculated. To examine inter and intra observer agreement, kappa values will be calculated. A P value of less than 0.05 is considered to be statistically significant. All the statistical analysis will be performed using SPSS software suite v.22.