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Table 1 Criteria for quality appraisal of the papers

From: New insight into the informal patients’ payments on the evidence of literature: a systematic review study

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?
  1. Source: Dixon-Woods, et al. 2006 [29]