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| Database | Initial search results | After title/Abstract screening | After full-text screening | Final included studies |
|---|---|---|---|---|
| IEEE xplore | 286 | 120 | 75 | 48 |
| ACM digital library | 196 | 89 | 52 | 25 |
| ScienceDirect | 166 | 76 | 44 | 22 |
| Scopus | 324 | 145 | 89 | 36 |
| SpringerLink | 207 | 104 | 60 | 28 |
| Other sources (backward/forward searches) | – | – | 31 | 21 |
| Total | 1,179 | 534 | 351 | 180 |
