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

Newcastle University, Bart's Health NHS Trust - The Royal London Hospital, Kilimanjaro Christian Medical University College, Kilimanjaro Christian Medical University College, Kilimanjaro Christian Medical University College, University of Leicester - Department of Neuroscience, Behaviour and Psychology, Cumbria Northumberland Tyne and Wear NHS Foundation Trust, Kilimanjaro Christian Medical University College, Kilimanjaro Christian Medical University College, Kilimanjaro Christian Medical University College, Northumbria Healthcare NHS Foundation Trust - North Tyneside General Hospital, Northumbria Healthcare NHS Foundation Trust, Newcastle University, Newcastle University, Mawenzi Regional Referral Hospital, Mawenzi Regional Referral Hospital, University of Ibadan - Neuroscience and Ageing Research Unit and Newcastle University

Northumbria University, Northumbria University, Northumbria University, Northumbria University, Northumbria Healthcare NHS Foundation Trust, Newcastle University, Oregon Health and Science University, Northumbria University and Northumbria University