1. Test for Helicobacter pylori. The test items include urease test, histology, bacterial
culture, serology, and urea breath test. At least two positive results can be used to
confirm the diagnosis.
2. To ensure that the research results are not artificially distorted, this trial is a
randomized study. Random allocation (which means that the subjects will use the "random
number table generated by a computer similar to the lottery" to determine the treatment
group) accept one of the following schemes (1:1:1).