Graham m. fl. gennemførte en prospektiv, dobbeltblind RCT - undersøgelse af 537 patienter uden H. pylori - infektion med langtidsbrug af NSAID og endoscopisk bekræftet gastrisk ulcus.
Graham et al conducted a prospective; double blind RCT 4 among 537 patients without H. pylori infection who were long-term users of NSAIDs with a history of endoscopically documented gastric ulcer.