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| MeSH keywords | Database | Number of articles |
| Proton Pump Inhibitors (PPIs) | PubMed | 1,429 |
| Helicobacter pylori | PubMed | 1,633 |
| Stomach neoplasms | PubMed | 8,137 |
| PPIs + Helicobacter pylori | PubMed | 224 |
| PPIs + stomach neoplasms | PubMed | 67 |
| Helicobacter pylori + stomach neoplasms | PubMed | 413 |
| PPIs + Helicobacter pylori + stomach neoplasms | PubMed | 29 |
