Table 2.

Characteristics of included studies based on modified CONSORT criteria.

Reference	Sample Fabrication Technique	Sample Size	Sample Randomization	Sample Power Calculation	Testing Standards	Blinding of Operator	Research Finding	Risk of Bias
[19]	0	0	2	2	0	2	0	Moderate
[20]	0	0	2	2	0	2	0	Moderate
[21]	0	0	2	2	0	2	0	Moderate
[22]	0	0	2	2	2	2	0	Moderate
[23]	0	0	2	1	0	2	0	Moderate
[24]	0	0	2	2	2	2	0	Moderate
[25]	0	0	2	2	0	2	0	Moderate
[26]	0	0	2	2	2	2	0	Moderate
[27]	0	0	2	0	0	2	0	Low
[28]	1	0	2	2	1	2	0	Moderate
[29]	1	0	2	2	0	2	0	Moderate
[30]	1	1	2	2	0	2	0	Moderate
[31]	0	0	2	0	2	2	0	Moderate
[32]	0	0	2	2	0	2	0	Moderate
[33]	0	0	2	2	0	2	0	Moderate
[34]	0	0	2	2	2	2	0	Moderate
[35]	0	0	2	2	0	2	0	Moderate
[36]	0	0	2	2	0	2	0	Moderate
[37]	0	0	2	2	0	2	0	Moderate
[38]	0	0	2	0	0	2	0	Low
[39]	0	0	2	2	0	2	0	Moderate
[40]	0	0	2	2	0	2	0	Moderate