Heterogeneity of Parkinson's disease in the early clinical stages using a data driven approach.
Lewis SJ; Foltynie T; Blackwell AD; Robbins TW; Owen AM; Barker RA; Journal Of Neurology, Neurosurgery, And Psychiatry, 2005, vol. 76, issue 3, p 343, ISSN 00223050. ISBN 00223050.

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