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patient therapy study endoscopic ulcer endoscopy trial endoscopic therapy gastroenterology rebleeding peptic peptic ulcer group randomized treatment inhibitor nonvariceal consensus nvugih gastroenterol intervention guideline barkun quality evidence analysis management peptic ulcers mortality statement blood american outcome ppi therapy result hemorrhage astrazeneca pylori high-dose stigmata recommendation review j gastroenterol helicobacter pylori infection cox -2 inhibitor research gastrointest endosc number panel proton american journal endoscopic hemostasis injection method end point point endoscopic treatment medicine measure level meta-analysi health process lesion hemostasi indicator study intervention 24 hours hospital signi canada bardou nsaid criteria participant laine volume practice surgery helicobacter