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Study quality assessment (see 14 questions in Appendix B)
| First author (year) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | Total score |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ewing (2006) 33 | Y | Y | Y | Y | N | Y | Y | Y | NA | Y | Y | Y | Y | Y | 12 |
| Guarnizo‐Herreño (2019) 34 | Y | Y | Y | Y | N | N | N | Y | Y | Y | Y | Y | NA | Y | 10 |
| Guettabi (2014) 35 | Y | Y | N | Y | N | Y | Y | Y | Y | NA | Y | Y | NA | Y | 10 |
| Schwartz (2011) 36 | Y | Y | Y | Y | N | N | N | Y | Y | Y | Y | Y | NA | N | 9 |
| Seliske (2012) 37 | Y | Y | N | Y | N | N | N | Y | Y | N | Y | Y | NA | Y | 8 |
Abbreviation: NA, not available.
