Endoscopic study on zonal gastritis.
D000328:Adult; D000368:Aged; D005260:Female; D005756:Gastritis / Q000473:pathology*; D005757:Gastritis, Atrophic / Q000209:etiology / Q000473:pathology*; D005773:Gastroscopy; D006801:Humans; D008297:Male; D008875:Middle Aged; D013276:Stomach Ulcer / Q000150:complications