The criteria for including 'Grey Literature' in a systematic review are:

  • Relevance: The literature should directly address the research question (Higgins et al., 2019).
  • Quality: It should meet acceptable standards for methodological rigor (Moher et al., 2015).
  • Credibility: Sources must be from reputable organizations (e.g., government agencies, academic institutions) (Davis et al., 2008).
  • Accessibility: The material should be publicly accessible or retrievable (Garg et al., 2019).
  • Comprehensiveness: It helps reduce publication bias by including non-peer-reviewed sources (Sterne et al., 2016).
  • References:

  • Higgins, J. P. T., et al. (2019). Cochrane Handbook for Systematic Reviews of Interventions.
  • Moher, D., Liberati, A., Tetzlaff, J., Altman, D. G., & The PRISMA Group (2015). Preferred Reporting Items for Systematic Reviews and Meta-Analyses: The PRISMA Statement.
  • Davis, P., et al. (2008). Grey Literature and Systematic Reviews.
  • Garg, A., et al. (2019). Systematic Reviews in Health Research.
  • Sterne, J. A., et al. (2016). Addressing publication bias in systematic reviews.
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