Table 2. Risk of bias assessment of the included studies.

S.No	Author and Year	Random sequence generation (Selected bias)	Allocation concealment (selection bias)	Blinding of participants and personnel (performance bias)	Blinding of outcome assessment (detection bias)	Incomplete outcome data (Attrition bias)	Selective reporting (reporting bias)	Other bias	Jadad Score
1	Corey SM et al. 2014 [81]	Low risk	unclear	High risk	High risk	High risk	Low risk	Unclear	2
2	Hegde et al. 2013 [49]	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	4
3	Kanaya Am et al. 2014 [72]	Low risk	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	3
4	Keerthi GS et al. 2017 [66]	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
5	Lau Caren et al. 2015 [83]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
6	McDermott KA et al. 2014 [69]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	4
7	Netam et al. 2015 [67]	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
8	Siu et al. 2015 [84]	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
9	Sohl et al. 2016 [71]	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
10	Supriya et al. 2017 [73]	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
11	Tyagi A et al. 2014 [68]	Low risk	Unclear	Low risk	Low risk	Low risk	High risk	Unclear	2
12	Wolff M et al. 2013 [85]	Low risk	High risk	Low risk	Low risk	Low risk	Low risk	Low risk	3
13	Yadhav et al. 2018 [70]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	4
14	Yang K et al. 2011 [86]	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	Low risk	4

Jadad Score:

Randomisation (0–2 points), blinding (0–2 points)

Dropouts and withdrawals (0–1 point)

Score ≤2 indicates low quality, whereas a score of ≥3 indicates high quality