ABBREVIATIONSAGREE Appraisal of Guidelines for Research andEvaluationAUC area under the curveCE chromoendoscopyCI confidence intervalCOX cyclo-oxygenaseEGC early gastric cancerEHMSG European Helicobacter and Microbiota StudyGroupESD endoscopic submucosal dissectionESGE European Society of GastrointestinalEndoscopyESP European Society of PathologyGI gastrointestinalGRADE Grading of Recommendations Assessment,Development, and EvaluationHD-WLE high definition white-light endoscopyHGD high grade dysplasiaHR hazard ratioIM intestinal metaplasiaLGD low grade dysplasiaMAPS Management of precancerous conditions andlesions in stomachNBI narrow-band imagingNSAID nonsteroidal anti-inflammatory drugOLGA Operative Link on Gastritis AssessmentOLGIM Operative Link on Gastritis Assessment basedon Intestinal MetaplasiaOR odds ratioRCT randomized controlled trialRR relative riskSIR standardized incidence ratioSPED Sociedade Portuguesa de EndoscopiaDigestiva