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I don't know how to attach a pdf but the Jan-Feb 2020 newsletter of the Oregon State Beekeepers Association has a mention of a study by Oregon State University on page 14 on this topic -

The study is on-going so no conclusive results to report at this juncture.

Off topic, but in the same newsletter on page 1 is a small study which they did on the effect of formic acid and oxalic acid on brood which might be of interest.

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