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. 2014 Aug 18;2014:1709.
Ref (type) Population Outcome, Interventions Results and statistical analysis Effect size Favours
Adverse effects

RCT
588 white people with 1–30 actinic (solar) keratoses Skin reactions
32/210 (15%) with sunscreen (sun protection factor [SPF] 17)
28/221(13 %) with placebo (base cream with no active ingredient)