Detailed Instructions: Given an abstract, generate a keyword (a noun phrase) that best describes the focus or contribution of the paper. Such keywords can be directly from the given abstract or outside it.
Problem:Abstract: Statistically significant linear correlations between geographic variations in salt consumption and mortality from gastric, but not duodenal ulcer, are reported. It is suggested that dietary consumption of salt is a risk factor in mortality from gastric ulcer.
Solution:
Aged