Table 2.
Quality assessment for included trials
| Trial | Sequence generation | Allocation concealment | Blinding | Incomplete outcome data | Selective outcome reporting | Other source of bias | ||
|---|---|---|---|---|---|---|---|---|
| participants | personnel | outcome assessors | ||||||
| FOSIDIAL 2006 [9] | LOW | LOW | LOW | LOW | LOW | LOW | LOW | LOW |
| SAFIR 2014 [11] | LOW | UNCLEAR | LOW | LOW | UNCLEAR | LOW | LOW | LOW |
| Yilmaz 2010 [18] | UNCLEAR | UNCLEAR | HIGH | HIGH | HIGH | LOW | LOW | LOW |
| Philip 2003 [14] | LOW | LOW | HIGH | HIGH | HIGH | LOW | LOW | LOW |
| HDPAL 2014 [20] | LOW | LOW | HIGH | HIGH | HIGH | LOW | LOW | LOW |
| Suzuki 2008 [10] | LOW | LOW | HIGH | HIGH | HIGH | LOW | LOW | LOW |
| Takahashi 2006 [8] | LOW | LOW | HIGH | HIGH | LOW | LOW | UNCLEAR | UNCLEAR |
| OCTOPUS 2013 [19] | UNCLEAR | UNCLEAR | HIGH | HIGH | LOW | LOW | LOW | LOW |
| Suzuki 2004 [15] | LOW | LOW | HIGH | HIGH | HIGH | LOW | LOW | LOW |
| Wang J [16] | UNCLEAR | UNCLEAR | UNCLEAR | UNCLEAR | UNCLEAR | LOW | LOW | UNCLEAR |
| Zhong H [17] | UNCLEAR | UNCLEAR | UNCLEAR | UNCLEAR | UNCLEAR | LOW | LOW | UNCLEAR |
Assessment of risk bias according to the Cochrane Collaboration’s tool, low risk of bias was represented as “LOW” and high risk of bias was “HIGH”