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Correction notice This paper has been amended since it was published Online First. The second paragraph has been rewritten. Also on the first page, top of the second column the author cites a study published by The Lancet about the results of the long-awaited early stage PD MED study. The reference to this study has been added to the reference list.
Competing interests PW has received honoraria and consulting fees from Medtronic, Boehringer-Ingelheim, UCB Pharma, Brittania, Abbvie, Teva and Lundbeck.
Provenance and peer review Commissioned; externally peer reviewed. This paper was reviewed by Simon Lewis, Sydney, Australia.