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| Type | The Cochrane Library | PubMed (Since 2001) | Total |
|---|---|---|---|
| Primary studies | 0 | 101 | 101* |
| Systematic reviews, meta-analysis, guidelines or literature reviews | 5 | 25 | 30 |
* Six of these 101 studies were also included in the Cochrane systematic reviews (Dare, 2001; Bergh, 2002; Lock, 2005; Mc Intosh, 2005; Rausch, 2006; Munsch, 2007).
