Number of citations identified from the electronic databases for studies pertaining to the role of neck strength, rules and legislation in sport concussion prevention
| Electronic database | Number of neck strength citations | Number of rules citations | Number of legislation citations |
|---|---|---|---|
| Ovid MEDLINE (1946–September 2012) | 6201 | 337 | 428 |
| Ovid Healthstar (1966–November 2012) | 0 | 3 | 0 |
| SportDiscuss (1998–2012) | 0 | 0 | 0 |
| EMBASE (1980–2012 week 50) | 1 | 22 | 2 |
| PubMed (1960–September 2012) | 3 | 17 | 9 |
| CINAHL (1998–September 2012) | 0 | 3 | 0 |
| Ovid OLDMEDLINE (1946–1965) | 0 | 0 | 0 |
| Cochrane Database of Systematic Reviews (2005–November 2012) | 0 | 0 | 0 |
| Database of Abstracts of Reviews of Effects (4th Quarter 2012) | 0 | 0 | 0 |
| AMED—Allied and Complementary Medicine (1985–December 2012) | 0 | 2 | 0 |