Parkinson's disease dementia and dementia with Lewy bodies: different aspects of one entity

@article{Aarsland2009ParkinsonsDD,
  title={Parkinson's disease dementia and dementia with Lewy bodies: different aspects of one entity},
  author={Dag Aarsland and Elisabet Londos and Clive G Ballard},
  journal={International Psychogeriatrics},
  year={2009},
  volume={21},
  pages={216 - 219}
}
The combination of dementia and parkinsonism is common and distressing, and dementia associated with Parkinson’s disease (PDD) and dementia with Lewy bodies (DLB) are the most common causes. By definition, in PDD, dementia develops after more than one year with parkinsonism, whereas in DLB, dementia occurs before, simultaneously with, or within one year of the onset of parkinsonism. Whereas there are obvious clinical challenges in defining the exact timing of onset of two insidiously developing… 
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