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Study quality score.
| Study | Selection | Comparability | Outcome | Overall |
|---|---|---|---|---|
| Aberg (2012) | **** | ** | *** | 9 |
| Baumeister 2017 | **** | ** | ** | 8 |
| Crowley et al., 2015 | ** | ** | ** | 6 |
| Gubata. (2013) | * | ** | *** | 6 |
| Nyberg et al. (2018) | **** | ** | *** | 9 |
| Shigdel et al. (2019) | *** | ** | ** | 7 |
| Sui et al., 2009 | **** | ** | ** | 8 |
