Table 2.

The Cochrane Collaboration’s tool of assessing risk of bias for methodological assessment.

Author, Year	Random sequence generation	Allocation concealment	Blinding of Participants and personnel	Blinding of outcome assessments	Incomplete outcome data	Selective reporting	Other bias
[23] Yu, 2012	Low	Unclear	Unclear	Unclear	Low	Low	Low
[24] Anandkumar, 2014	Low	Low	Low	Low	Low	Low	Low
[25] Cho, 2015	Low	Low	Low	Low	High	Low	High
[26] Kocyigit, 2015	Low	Low	Low	Low	Low	Low	Low
[27] Wageck, 2016	Low	Low	Low	Low	High	Low	High
[28] Lee, 2016	High	Unclear	Unclear	Unclear	Low	Low	High
[29] Dhanakotti, 2016	Low	Low	High	Low	Low	Low	Low
[30] Kaya, 2016	Low	Low	Low	Low	High	Low	High
[31] Atya, 2015	Low	Low	Low	Low	Unclear	Low	Unclear
[32] Sedhom, 2016	Low	Unclear	Unclear	Unclear	Low	Low	High
[33] Malgaonkar, 2014	Low	Low	Unclear	Unclear	Low	Low	Unclear