Meta-analysis of early nonmotor features and risk factors for Parkinson disease.
Noyce, Alastair J.; Bestwick, Jonathan P.; Silveira-Moriyama, Laura; Hawkes, Christopher H.; Giovannoni, Gavin; Lees, Andrew J.; Schrag, Anette; Annals of Neurology, 2012, vol. 72, issue 6, p 893, ISSN 03645134. ISBN 15318249.

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