@article{leung2015-26519540,
  author  = {Leung, I. H. and Walton, C. C. and Hallock, H. and Lewis, S. J. and Valenzuela, M. and Lampit, A.},
  title   = {{Cognitive training in Parkinson disease: A systematic review and meta-analysis}},
  journal = {Neurology},
  year    = {2015},
  doi     = {10.1212/wnl.0000000000002145},
  pmid    = {26519540},
  url     = {https://doi.org/10.1212/wnl.0000000000002145}
}