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).
Kala KumaresanSara BengtssonSaber SamiAllan ClarkThomas HummelJames BoardmanJuliet HighRashed SobhanCarl Martin PhilpottPublished in: Pilot and feasibility studies (2023)
ISRCTN registry 39523. Date of registration in the primary registry: 23rd February 2021.