Table 3. AMSTAR 2 quality assessment tool.

AMSTAR: Assessment of Multiple Systemic Reviews [12]

Publication	Rabgay et al.[18]	Pagano et al. [19]	Scuteri et al. [20]
Did the research questions and inclusion criteria for the review include the components of PICO?	Y	Y	Y
Did the report of the review contain an explicit statement that the review methods were established prior to the conduct of the review, and did the report justify any significant deviations from the protocol?	Unclear	Unclear	Unclear
Did the review authors explain their selection of the study designs for inclusion in the review?	Y	Y	Y
Did the review authors use a comprehensive literature search strategy?	Y	Y	Y
Did the review authors perform study selection in duplicate?	Y	Y	Y
Did the review authors provide a list of excluded studies and justify the exclusions?	Unclear	Unclear	Unclear
Did the review authors describe the included studies in adequate detail?	Y	Y	Y
Did the review authors use a satisfactory technique for assessing the risk of bias (RoB) in individual studies that were included in the review?	Y	Y	Y
Did the review authors report on the sources of funding for the studies included in the review?	Y	Y	Y
Did the review authors account for RoB in individual studies when interpreting/discussing the results of the review?	Unclear	Y	y
Did the review authors provide a satisfactory explanation for, and discussion of, any heterogeneity observed in the results of the review?	Y	Y	Y