Table 1 Example of a search string for the database of PubMed/MEDLINE.

From: Exploring the association between serotonin transporter promoter region methylation levels and depressive symptoms: a systematic review and multi-level meta-analysis

Database: PubMed/MEDLINE

Methyl* [Title/Abstract] AND (5-HTT [Title/Abstract] OR 5-HTTLPR [Title/Abstract] OR serotonin- linked polymorphic region [Title/Abstract] OR SLC6A4 [Title/Abstract] OR serotonin transporter [Title/Abstract]) AND (Depress* [Title/Abstract] OR MDD [Title/Abstract])

MeSH terms: Methylation, SLC6A4, Depression

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