“…According to the AMSTAR-2 scoring criteria ( Figure 3 ), 2 SRs were rated “high.” 2 SRs were rated “moderate,” 6 SRs were rated “low,” and 24 SRs were rated “critically low.” The main reasons for downgrading the SRs were as follows: there was no protocol reported before the review or no explanation for differences from protocol [ 35 – 38 , 42 – 47 , 51 , 52 , 55 – 57 , 61 , 65 – 67 ]; there was no list of excluded studies and reasons for exclusion [ 34 – 37 , 39 , 40 , 42 , 43 , 45 – 47 , 51 , 55 – 57 , 59 – 62 , 65 – 67 ]; there was no explanation for the study design included in the SRs [ 34 – 42 , 45 – 53 , 55 , 57 – 62 , 64 – 67 ]; there was no report of funding sources for studies included in the SRs [ 35 – 47 , 50 , 51 , 55 – 58 , 60 – 62 , 65 – 67 ]; the risk bias of the included studies was not considered when interpreting or discussing the study results [ 35 – 38 , 40 , 43 , 46 , 47 , 50 , 51 , 56 , 57 , 59 , 62 , 63 , 66 ]; the publication bias was not adequately investigated when quantitative synthesis...…”