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"When a summary does not exist for a clinical problem, then synopses of syntheses are the next best source. A synthesis or systematic review is a comprehensive summary of all the research evidence related to a focused clinical question...The advantages of finding a relevant synopsis of a synthesis are 2-fold: first, the synopsis provides a convenient summary of the corresponding synthesis, and second, it is often accompanied by a commentary that addresses the methodological quality of the synthesis and the clinical applicability of its findings." Dicenso, A., Bayley, L., & Haynes, R. B. (2009)
"If more detail is needed or no synopsis exists, then databases of syntheses (systematic reviews) are available" Dicenso, A., Bayley, L., & Haynes, R. B. (2009)