Table 1. Article yield by keyword.
| Keyword | Number of articles | Database |
| Multiple sclerosis | 43,747 | PubMed |
| Serotonin levels | 9,720 | PubMed |
| Multiple sclerosis and serotonin | 129 | PubMed |
| Chemistry of multiple sclerosis | 4,401 | PubMed |
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