Table 2 Best evidence synthesis
1.Strong evidence is provided by consistent findings among multiple high-quality studies
2.Moderate evidence is provided by consistent findings among multiple low-quality studies and/or one high-quality study
3.Limited evidence is provided by a single low-quality study
4.Conflicting evidence is provided by inconsistent findings among multiple studies (ie, <75% of the studies reported consistent findings)
5.No evidence is provided when no studies were found