6Klepac N,Hajnsek S,Trkulja V.Cognitive performance in nondemented nonpsychotic Parkinson disease patients with or without a history of depression prior to the onset of motor symptoms[J].J Geriatr Psychiatry Neurol,2010,23(1):15.
7Aarsland D,Brnnick K,Ehrt U,et al.Neuropsychiatric symptoms in patients with Parkinson's disease and dementia:frequency,profile and associated care giver stress[J].J Neurol Neurosurg Psychiatry,2007,78(1):36.
8Lo RY,Tanner CM,Albers KB,et al.Clinical features in early Parkinson disease and survival[J].Arch Neurol,2009,66(11):1353.
