Article 1 Atrophic 1 ELISA 1 Gastrin‑17 1 Gastritis 1 Helicobacter infection 1 Metaplasia Pepsinogens 1 area under the curve 1 atrophic gastritis 1 biological marker 1 clinical article 1 controlled study 1 correlation analysis 1 cross-sectional study 1 diagnostic test accuracy study 1 duodenoscopy 1 dyspepsia 1 enzyme linked immunosorbent assay 1 female 1 gastrin 17 1 histopathology 1 human 1 human tissue 1 intestine metaplasia 1 ischemic heart disease 1 male 1 oesophageal gastro duodenoscopy 1 pepsinogen 1 pepsinogen I 1