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Funding: This work was supported by a grant from France Parkinson, ADPLA (association des parkinsoniens de Loire Atlantique), Groupement de Parkinsoniens de Vendée and Inserm/DHOS (to PDe and MN). PDe and MN are recipients of a Contrat d’Interface Inserm.
Competing interests: None.
Ethics approval: The study protocol was approved by the local Committee on Ethics and Human Research on 27 February 2007.
TC and TL as well as PD and MN contributed equally to this work.
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