Table 4. Quality assessment of selected studies.

Risk of Bias Assessment

Study ID	Year	Random Sequence Generation	Allocation Concealment	Blinding of Participants and Personnel	Blinding of Outcome Assessment	Incomplete Outcome Data	Selective Outcome Reporting	Quality of Studies
Nishina [2]	1995	unclear	low	low	low	low	low	fair
Mikawa [12]	1996	low	low	low	low	low	low	good
Nishina [13]	1997	unclear	unclear	low	unclear	high	low	poor
Shajar [19]	1999	low	low	low	low	low	low	good
Jee [14]	2002	high	unclear	low	low	low	low	fair
Andrzejowski [17]	2002	unclear	low	low	low	high	low	poor
Guler [15]	2005	unclear	low	low	low	low	low	fair
Turan [25]	2008	unclear	low	low	low	low	low	fair
Aouad [22]	2009	low	low	low	low	low	low	good
Nho [21]	2009	low	low	low	low	low	low	good
Aksu [3]	2009	unclear	low	low	low	low	low	fair
Moustafa [20]	2012	unclear	unclear	low	low	low	Low	fair
Bindu [29]	2013	low	unclear	low	low	low	low	fair
Mahoori [16]	2014	low	unclear	low	low	unclear	low	poor
Zhoo Xiaochun [7]	2014	low	low	low	low	low	low	good
Sharma [26]	2014	Low	low	low	low	low	low	good
Lee [18]	2014	low	low	low	low	low	low	good
Kothari [28]	2014	Low	low	low	low	low	low	good
Gao [27]	2014	low	unclear	low	low	high	low	poor
Qing Fan [23]	2015	low	low	low	low	low	low	good
Kim [6]	2015	low	unclear	low	unclear	low	Low	fair
Mistry [5]	2016	low	low	low	low	low	low	good
Shruthi [30]	2016	low	low	low	low	low	low	good
Dutta [24]	2016	unclear	low	low	low	low	low	fair