@article{muller2013-23239424,
  author  = {Müller, M. L. and Frey, K. A. and Petrou, M. and Kotagal, V. and Koeppe, R. A. and Albin, R. L. and Bohnen, N. I.},
  title   = {{β-Amyloid and postural instability and gait difficulty in Parkinson's disease at risk for dementia}},
  journal = {Movement disorders : official journal of the Movement Disorder Society},
  year    = {2013},
  doi     = {10.1002/mds.25213},
  pmid    = {23239424},
  url     = {https://doi.org/10.1002/mds.25213}
}