21.   We correlated these findings with endoscopic mucosal damage, the presence or absence of Helicobacter pylori, and the degree of histological gastritis.

22.   Establishment of a causal role for leukotrienes in the pathogenesis of mucosal damage has, however, remained elusive.

23.   Models of mucosal damage in which a noxious agent such as ethanol is employed are simply not relevant to chronic duodenal ulcer.