Research Article Duodenal ulcer: the villain unmasked? British Medical Journal 1991; 302 doi: https://doi.org/10.1136/bmj.302.6782.919 (Published 20 April 1991) Cite this as: British Medical Journal 1991;302:919 Article Related content Metrics Responses Peer review Related articles Letter Helicobacter pylori infection and duodenal ulcer. Published: 22 June 1991; British Medical Journal 302 doi:10.1136/bmj.302.6791.1534-c Letter Duodenal ulcer, gastric acid, and Helicobacter pylori. Published: 01 June 1991; British Medical Journal 302 doi:10.1136/bmj.302.6788.1333-a See more Cholera: Malawi is in grip of its deadliest outbreak BMJ February 09, 2023, 380 p328; DOI: https://doi.org/10.1136/bmj.p328 Emergency care is in “dire” situation after loss of NHS beds, says royal college BMJ May 31, 2022, 377 o1376; DOI: https://doi.org/10.1136/bmj.o1376 GP efforts to cut antibiotic use failed to curb spread of drug resistant E coli, evaluation finds BMJ August 05, 2021, 374 n1953; DOI: https://doi.org/10.1136/bmj.n1953 Check covid status when planning emergency bowel surgery, doctors are told BMJ March 11, 2021, 372 n695; DOI: https://doi.org/10.1136/bmj.n695 Capsule endoscopies will be trialled in England BMJ March 11, 2021, 372 n692; DOI: https://doi.org/10.1136/bmj.n692