@article{pigott2015-26362285,
  author  = {Pigott, K. and Rick, J. and Xie, S. X. and Hurtig, H. and Chen-Plotkin, A. and Duda, J. E. and Morley, J. F. and Chahine, L. M. and others},
  title   = {{Longitudinal study of normal cognition in Parkinson disease}},
  journal = {Neurology},
  year    = {2015},
  doi     = {10.1212/wnl.0000000000002001},
  pmid    = {26362285},
  url     = {https://doi.org/10.1212/wnl.0000000000002001}
}