Table 3 Quality assessment of included studies
Study | Downs checklist | Methodological quality |
|---|---|---|
Kirschniak et al. [16] | 9 | Low |
Albert et al. [17] | 9 | Low |
Manta et al. [18] | 10 | Moderate/low |
Mönkemüller et al. [19] | 8 | Low |
Chan et al. [11] | 10 | Moderate/low |
Skinner et al. [12] | 10 | Moderate/low |
Manno et al. [20] | 10 | Moderate/low |
Wedi et al. [21] | 9 | Low |
Richter-Schrag et al. [22] | 15 | Moderate |
Lamberts et al. [23] | 11 | Moderate/low |
Goenka et al. [24] | 9 | Low |
Wedi et al. [25] | 12 | Moderate/low |
Schmidt et al. [26] | 20 | High |
Asokkumar et al. [27] | 14 | Moderate/low |
Manta et al. [13] | 14 | Moderate/low |
Gölder et al. [28] | 17 | Moderate |