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Reasons for exclusion.
| Reason | Number of Studies |
|---|---|
| Wrong setting or concerns regarding the setting | 76 |
| Wrong sample | 5 |
| No mental health outcome investigated | 18 |
| No environmental stimuli | 25 |
| Specific therapeutic approach | 7 |
| No relationship investigated between features of a TL and MH outcomes | 32 |
| Methodological concerns | 23 |
| Wrong type of paper | 26 |
| Study did not meet any inclusion criteria (e.g., validation of questionnaires) | 23 |
| Study not available | 2 |
