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