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Eligibility criteria based on the PICOS strategy.
| Inclusion Criteria | Exclusion Criteria | |
|---|---|---|
| Population | Rodents | Humans and other species |
| Intervention | Environmental Enrichment | Absence of the Environmental Enrichment |
| Comparator | Animals that did not undergo Environmental Enrichment | Absence of the control group |
| Outcomes | Cytokines and immune cells | No Cytokines and immune cells |
| Study design | Experimental | Observational, reviews, case reports, and scientific abstracts |
