1. Department of Neurology, Hospital Universitario Burgos, Burgos, Spain
2. Department of Health Science, University of Burgos, Burgos, Spain
3. Department of Neurology, Mayo Clinic, Rochester, MN, USA
4. Department of Neurology, Radboud University Medical Centre, Donders Institute for Brain, Cognition and Behavior, Centre of Expertise for Parkinson and Movement Disorders, Nijmegen, The Netherlands
5. Cleveland Clinic Lou Ruvo Center for Brain Health Department, Las Vegas, NV, USA