| Review | Number Retrieved | After Duplicate Removal | Update Search Date | Number Retrieved | After Duplicate Removal |
| MEDLINE | 639 | 616 | 29 April 2013 | 90 | 75 |
| MEDLINE In‐Process | 29 | 29 | 29 April 2013 | 16 | 14 |
| CCRT | 153 | 127 | 29 April 2013 | 10 | 2 |
| CDSR DARE | 664 | 650 | 29 April 2013 | 324 | 169 |
| IPA | 40 | 10 | 29 April 2013 | 7 | 4 |
| PsycINFO | 147 | 85 | 29 April 2013 | 5 | 3 |
| EMBASE | 2,884 | 2,511 | 30 April 2013 | 508 | 411 |
| CINAHL | 213 | 70 | 30 April 2013 | 31 | 21 |
| Total | 4769 | 4098 | 991 | 699 |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.