High definition white light endoscopy will initially be performed. The specific location of all mucosal findings in the stomach such as ulceration or nodularity which require biopsy will be noted by the endoscopist and research coordinator but will not be biopsied until after NBI. This is done so that blood will not distort or bias NBI assessment. Any abnormal findings in other parts of the GI tract examined using the scope (esophagus and duodenum) will be noted and biopsied.