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. 2019 Apr 23;2019(4):CD007019. doi: 10.1002/14651858.CD007019.pub3
№ of studies Study design Risk of bias Inconsistency Indirectness Imprecision Other considerations Certainty
(overall score)
Costs
1 Controlled before‐after study Very serious risk of bias
(‐2)
No serious inconsistency
(0)
No serious indirectness
(0)
No serious imprecision
(0)
None ⨁◯◯◯
 Very low