World Health Organization (WHO) - Brain Health Unit, World Health Organization (WHO) - Brain Health Unit, University of Florida - Department of Neurology, University of Southampton - Department of Gerontology, University of Rochester Medical Center, Radboud University Nijmegen - Donders Institute for Brain, Cognition and Behaviour, Parkinson’s Disease and Movement Disorder Society, Chulalongkorn University - Chulalongkorn Centre of Excellence for Parkinson’s Disease & Related Disorders, World Health Organization (WHO) - Chemical Safety and Health Unit, University Teaching Hospital (UTH), Lusaka, World Health Organization (WHO) - Brain Health Unit, Edmond J. Safra Foundation, University of Burgos - Hospital Universitario de Burgos, Hofstra Northwell - Donald and Barbara Zucker School of Medicine, The Michael J. Fox Foundation, University of Liverpool - Department of Primary Care and Mental Health, The University of Sydney - Movement Disorders Unit, Favaloro Foundation University Hospital - Institute of Neuroscience, Person with Parkinsons; PD Avengers, Neurological Health Charities Canada, Qatar University - Department of Physiotherapy, Charité - Universitätsmedizin Berlin - Movement Disorder and Neuromodulation Unit, Malaysian Parkinson’s Disease Association, University of Malaya (UM) - Division of Neurology, Parkinson Canada, Parkinson Canada, University of Oxford, Johns Hopkins University - Department of Neurology, Cornell University - Weill Cornell Parkinson’s Disease and Movement Disorders Institute, University of Lagos - College of Medicine, National Institute of Mental Health and Neurosciences (NIMHANS), Columbia University - Irving Medical Center, Ain Shams University - Department of Neurology, The Michael J. Fox Foundation, The Michael J. Fox Foundation, The Michael J. Fox Foundation, Charité - Universitätsmedizin Berlin - Department of Gynaecology, Northumbria Healthcare NHS Foundation Trust and World Health Organization (WHO) - Brain Health Unit

University of Calgary, University of Calgary, affiliation not provided to SSRN, affiliation not provided to SSRN, The University of Sydney - Westmead Hospital, University of Colorado, Aurora, The University of Sydney - Movement Disorders Unit, affiliation not provided to SSRN, University of Florida, affiliation not provided to SSRN, Washington University in St. Louis, Cardiff University, Washington University in St. Louis, University of New Mexico, Washington University in St. Louis, University of Calgary and Emory University