| Database | 2008 | 2012 | 2013 | 2014 | 2016 | Total | ||||||
| Number retrieved | After duplicates removed | Number retrieved | After duplicates removed | Number retrieved | After duplicates removed | Number retrieved | After duplicates removed | Number retrieved | After duplicates removed | Number retrieved | After duplicates removed | |
| MEDLINE | 2844 | 2742 | 639 | 616 | 90 | 75 | — | — | 326 | 231 | 3899 | 3664 |
| MEDLINE In‐Process | 29 | 29 | 29 | 29 | 16 | 14 | — | — | — | — | 74 | 72 |
| CCRT | 153 | 126 | 153 | 126 | 10 | 2 | — | — | — | — | 316 | 254 |
| CDSR DARE | 664 | 650 | 664 | 650 | 324 | 169 | — | — | — | — | 1652 | 1469 |
| IPA | 109 | 27 | 40 | 10 | 7 | 4 | — | — | — | — | 156 | 41 |
| PsycINFO | 255 | 147 | 147 | 85 | 5 | 3 | — | — | — | — | 407 | 235 |
| EMBASE | 6357 | 5548 | 2884 | 2517 | 508 | 412 | 794 | 787 | 626 | 516 | 11,169 | 9780 |
| CINAHL | 712 | 190 | 263 | 70 | 31 | 21 | — | — | — | — | 1006 | 281 |
| Total | 11,123 | 9459 | 4819 | 4103 | 991 | 700 | 794 | 787 | 952 | 747 | 18,679 | 15,796 |
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