Table 1.
Quality assessment of selected studies.
| Reference | Date of publication | NOS rating | ||
|---|---|---|---|---|
| Selection | Comparability | Outcome | ||
| Eiser [17] | 2001 | ∗∗∗ | ∗ | ∗∗∗ |
| Davis et al. [18] | 2002 | ∗∗∗∗ | ∗∗ | ∗∗∗ |
| Refaat et al. [19] | 2002 | ∗∗ | ∗ | ∗∗∗ |
| Rödl et al. [20] | 2002 | ∗∗∗ | ∗∗ | |
| Zahlten-Hinguranage et al. [21] | 2004 | ∗∗ | ∗ | ∗∗ |
| Pardasaney et al. [11] | 2006 | ∗∗∗ | ∗ | ∗ |
| Schreiber et al. [22] | 2006 | ∗∗∗∗ | ∗∗ | ∗∗∗ |
| Thijssens et al. [23] | 2006 | ∗∗∗ | ∗ | ∗∗∗ |
| Weiner et al. [24] | 2006 | ∗∗∗ | ∗ | ∗∗∗ |
| Aksnes et al. [25] | 2008 | ∗∗∗ | ∗ | ∗∗∗ |
| Davidge et al. [26] | 2009 | ∗∗∗ | ∗∗ | ∗∗∗ |
| Paredes et al. [27] | 2011 | ∗∗∗ | ∗ | ∗∗ |