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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.