Citations of trials and reviews of direct relevance
| Cited trials or reviews of direct relevance and no additional studies were identified | 11 protocols (16%) |
| Cited no trials or reviews of direct relevance and no relevant studies were identified | 48 protocols (72%) |
| Protocols where no additional relevant trials or reviews were identified through our searches | 59 protocols (88%) |
| Cited trials or reviews of direct relevance, but additional relevant studies were identified | 1 protocol (1%) |
| Cited no trials or reviews of direct relevance, but relevant studies were identified | 7 protocols (11%) |
| Protocols where additional relevant trials or reviews were identified through our searches | 8 protocols (12%) |
| Total | 67 protocols (100%) |