1. National Parkinson Foundation International Centre of Excellence; King's College Hospital NHS Foundation Trust; London UK
2. National Centre of Epidemiology and Centre for Networked Biomedical Research on Neurodegenerative Diseases (CIBERNED); Carlos III Institute of Health; Madrid Spain
3. King's College London; London
4. United Lincolnshire Hospitals NHS Trust; Lincoln UK
5. Addenbrooke's Hospital; Cambridge UK
6. Yeovil Hospital NHS Foundation Trust; Somerset UK
7. Salford Royal NHS Foundation Trust; Manchester UK