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Grey matter atrophy in cognitively impaired Parkinson's diseaseMelzer, T. R.; Watts, R.; MacAskill, M. R.; Pitcher, T. L.; Livingston, L.; Keenan, R. J.; Dalrymple-Alford, J. C.; Anderson, T. J. · Journal of Neurology, Neurosurgery & Psychiatry · 2012