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Table representing the selection of the studies.
| Results derived from search (n= 349) Duplicate results excluded (n=168) |
| Studies screened by title or abstract (n= 181) Irrelevant studies excluded (n=73) |
| Full text studies included for further evaluation (n=108) Studies excluded (n=54) (full text not retrieved = 29) (ineligible studies = 25) |
| Included studies (n= 54) |
