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What do systematic reviews say?

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Evidence found and GRADE certainty

156 questions · 156 findings · 32 reviews · Skin

No studies found 115 · 73.7%GRADE not reported 15 · 9.6%Very low 10 · 6.4%Low 8 · 5.1%Moderate 7 · 4.5%High 1 · 0.6%