Table 3.

Assessment of studies with risk of bias.

Author	Random sequence generation?	Allocation concealment?	Blindness of participants and professionals?	Blindness of outcome assessors?	Incomplete outcomes?	Report of a selective outcome?	General evaluation of bias
[1] Acharya et al., 2013							High
[2] Bansal and Mahajan, 2017							High
[3] Bevilacqua et al., 2016							High
[4] Du et al., 2008							Moderate
[5] Gopinath et al., 2015							Low
[6] Hall et al., 2017							Low
[7] Narongdej et al., 2010							Moderate
[8] Neuhaus et al., 2013							Low
[9] Pradeep and Sharma, 2010							Low
[10] Rajesh et al., 2012							High
[11] Salian et al., 2010							Low
[12] Samuel et al., 2015							Moderate
[13] Sharma et al., 2010							Moderate
[14] Shashirekha and Jena, 2015							Low
[15] Tirapelli et al., 2011							Low

Legend: GREEN – low. YELLOW – moderate. RED: - high.