Helicobacter pylori-Negative Duodenal Ulcers: Prevalence, Clinical Characteristics, and Prognosis-Results From a Randomized Trial With 2-Year Follow-Up.
Bytzer, Peter MD, PhD 1; Teglbjaerg, Peter Stubbe MD 1; Danish Ulcer Study Group
[Article] American Journal of Gastroenterology. 96(5):1409-1416, May 2001.

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