Table 2.
Quality assessment of the included studies.
| Random sequence generation | Concealment of allocation | Double blind | Withdrawals and dropouts | Total score | ||
|---|---|---|---|---|---|---|
| Blondeau et al. [17] | 2019 | 2 | 0 | 0 | 1 | 3 |
| Noecker et al. [21] | 2003 | 2 | 2 | 1 | 1 | 6 |
| Kammer et al. [16] | 2010 | 2 | 2 | 1 | 1 | 6 |
| Konstas et al. [22] | 2007 | 1 | 1 | 1 | 1 | 4 |
| Noecker et al. [23] | 2006 | 2 | 1 | 1 | 1 | 5 |
| Gandolfi and Cimino [18] | 2003 | 1 | 1 | 1 | 1 | 4 |
| Kuwayama and Komemushi [24] | 2008 | 2 | 2 | 1 | 1 | 6 |
| Traverso et al. [25] | 2010 | 2 | 2 | 2 | 1 | 7 |
| Ge et al. [8] | 2015 | 2 | 2 | 1 | 1 | 6 |
| Mizoguch et al. [26] | 2012 | 1 | 1 | 0 | 1 | 3 |