1 Department of Neurology, Safarik University, Kosice, Slovakia.
2 Department of Neurology, University Hospital of L. Pasteur, Kosice, Slovakia.
3 Rush University Medical Center, Department of Neurological Sciences, Section of Parkinson Disease and Movement Disorders, Chicago, Illinois, USA.
4 Sobell Department of Motor Neuroscience & Movement Disorders & The National Hospital for Neurology & Neurosurgery, London, UK.
5 Morton and Gloria Shulman Movement Disorders Centre and the Edmond J Safra Program in Parkinson's disease, Toronto Western Hospital, Toronto, Ontario, Canada.
6 Applied Neuroscience Research Group, Central European Institute of Technology, CEITEC, Masaryk University, Brno, Czech Republic.
7 Department of Psychology, University of Amsterdam, Amsterdam, The Netherlands.
8 Department of Psychiatry, Leiden University Medical Centre, Leiden, and Centre of Mental Health Care Delfland, Delft, The Netherlands.
9 Department of Psychiatry, Perelman School of Medicine at the University of Pennsylvania and Parkinson's Disease and Mental Health Research, Education and Clinical Centers (PADRECC and MIRECC), Philadelphia Veterans Affairs Medical Center, Philadelphia, Pennsylvania, USA.
10 National Centre of Epidemiology and CIBERNED, Carlos III Institute of Health, Madrid, Spain.