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Summary of database searches
| Database (time) | Citations | Articles Reviewed | Unique Definitions |
| MEDLINE (1966-June 2004) | 493 | 157 | 10 |
| EMBASE (1975-2003) | 218 | 73 | 0 |
| International Pharmaceutical Abstracts | 16 | 3 | 0 |
| Information Sciences & Library Sciences Abstracts | 61 | 15 | 0 |
| Web of Science | 217 | 77 | 0 |
| Wilson Business Abstracts | 204 | 105 | 0 |
| Total | 1209 | 430 | 10 |
