1. Number of articles.
| Initial search result | After screening | |
| CENTRAL | 151 | 16 |
| EMBASE | 127 | 2 |
| MEDLINE | 110 | 3 |
| PsycINFO | 15 | 0 |
| MDSG | 28 | 3 |
| Clinicaltrials | 114 | 2 |
| CINAHL | 7 | 1 |
| WEBOFKN | 66 | 9 |
| TOTAL | 617 | 36 |
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