Best-Evidence Synthesis
When we applied criteria for the best-evidence synthesis, the mean score was 83.7% (range = 62.5%---100%, where 100% is the maximum obtainable score). Methodological quality ratings of each study are displayed in Table 3. The 7 studies exceeding the mean were subsequently included in a best-evidence synthesis. When we applied the criteria for ascertainment of evidence level for best-evidence synthesis, we deemed the level of evidence for all of these associations as limited