Table 5.
Number of studies per database.
| Database | Number of studies |
|---|---|
| ACM | 18 |
| PubMed | 91 |
| Cochrane | 13 |
| Scopus | 1837 |
| Science Direct | 510 |
| IEEE Xplore | 0 |
|
| |
| Total | 2469 |
|
| |
| Number of duplicated studies | 88 |
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