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This page is a summary of: A double-blinded randomised controlled trial of vitamin A drops to treat post-viral olfactory loss: study protocol for a proof-of-concept study for vitamin A nasal drops in post-viral olfactory loss (APOLLO), Pilot and Feasibility Studies, October 2023, Springer Science + Business Media,
DOI: 10.1186/s40814-023-01402-2.
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