The distinct cognitive syndromes of Parkinson's disease: 5 year follow-up of the CamPaIGN cohort

C. H Williams Gray, J. R Evans, A Goris, T Foltynie, M Ban, T. W Robbins, C Brayne, B. S Kolachana, D. R Weinberger, S. J Sawcer and R. A. Barker

Brain 132 ( 11 ): 2958 - 2969 , 2009