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Letter
Olfactory function in Parkinson's disease in ON versus OFF states

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Footnotes

  • Funding This research was funded by the Reta Lila Weston Trust for Medical Research.

  • Competing interests None.

  • Patient consent Obtained.

  • Ethics approval Ethics approval was provided by the The National Hospital for Neurology and Neurosurgery and The Institute of Neurology Joint Research Ethics Committee.

  • Provenance and peer review Not commissioned; externally peer reviewed.