Table 3 Assessment of bias of the primary studies

Experimental algorithm not commercially available

[9, 28, 45, 53, 74, 89, 92, 117, 120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152]

Assumption of zero-change dataset cannot be guaranteed

[80, 95, 152]

Inadequate description of statistical analysis

[72, 93, 148, 152]

Non-consecutive or convenience sample

[60, 71]

Study population is inadequately described

[26, 77]