Table 3.

AMSTAR classification of systematic reviews included.

Criteria	Agmon et al., 2014	Fritz et al., 2015	He et al., 2018	Lauenroth et al., 2016	Law et al., 2014	Pichierri et al., 2011	Plummer and Iyigün, 2018	Wajda et al., 2017
1. was a “priori” design provided?	Yes	Yes	Yes	Yes	Yes	No	No	Yes
2. was there duplicate study selection and data extraction?	Yes	No	No	Yes	Yes	Yes	Yes	No
3. was a comprehensive literature performed?	No	No	Yes	No	No	No	Yes	Yes
4. was the status of publication used as an inclusion criterion?	No	No	No	No	No	No	No	No
5. was a list of studies (included and excluded) provided?	No	No	No	No	No	No	Yes	No
6. were the characteristics of the included studies provided?	No	Yes	Yes	Yes	Yes	Yes	No	Yes
7. was the scientific quality of the included studies assessed and documented?	No	Yes	Yes	Yes	No	Yes	Yes	Yes
8. was the scientific quality of the included studies used appropriately in formulating conclusions?	No	No	No	No	No	No	No	No
9. were the methods used to combine the findings of studies appropriate?	Yes	No	No	Yes	No	No	Yes	No
10. was the likelihood of publication bias assessed?	No	No	Yes	Yes	No	No	Yes	No
11. was the conflict of interest stated?	Yes	Yes	Yes	Yes	Yes	Yes	No	Yes
Total	4	4	6	7	4	4	6	5
Score	Low	Low	Moderate	Moderate	Low	Low	Moderate	Low
Details	No Meta-analysis	No Meta-analysis	No Meta-analysis	No Meta-analysis	No Meta-analysis	No Meta-analysis	Meta-analysis	No Meta-analysis