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Criteria for quality appraisal of the papers
| Are the research goals and objectives clearly specified? | |
| Is the research design clearly specified and is it suitable for achieving research goals? | |
| Is the research process clearly explained? | |
| Are enough data displayed to support research interpretations and conclusions? | |
| Is the analysis method appropriate and adequately explained? |
Source: Dixon-Woods, et al. 2006 [29]
