Table 3

Risk of bias assessment of the included studies using the Cochrane risk of bias tool
Bias Random sequence generation (selection 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
Authors, year
Banasik et al., 2011 [23] Unclear Unclear High risk Unclear Low risk Low risk Low risk
Banerjee et al., 2007 [24] Low risk Low risk High risk Unclear High risk Low risk Low risk
Blank et al., 2003 [25] Unclear Unclear High risk Unclear High risk High risk High risk
Bower et al., 2011 [26] Low risk Low risk High risk Low risk Low risk Low risk Low risk
Carson et al., 2009 [27] Low risk Low risk High risk Low risk Low risk Low risk Low risk
Chandwani et al., 2010 [28] Low risk Unclear High risk Unclear Low risk Low risk Low risk
Danhauer et al., 2009 [29] Unclear Unclear High risk Unclear Low risk Low risk Low risk
Kovačič & Kovačič, 2011 [30] Low risk Low risk Low risk Low risk Unclear Low risk Low risk
Littman et al., 2011 [31] Low risk Unclear High risk High risk Low risk Low risk Low risk
Moadel et al., 2007 [32] Unclear Unclear High risk Unclear Low risk Low risk Low risk
Raghavendra et al., 2007 [33] Low risk Low risk High risk Unclear High risk Low risk Low risk
Vadiraja et al., 2009 [34-36] Low risk Low risk High risk Unclear High risk High risk Low risk

Cramer et al.

Cramer et al. BMC Cancer 2012 12:412   doi:10.1186/1471-2407-12-412

Open Data