1. Lancaster Medical School; Lancaster University; Lancaster UK
2. Laboratory of Clinical Pharmacology and Therapeutics; Faculdade de Medicina de Lisboa; Lisboa Portugal
3. Instituto de Medicina Molecular; Lisboa Portugal
4. Department of Neurology; Salford Royal Hospital; Salford UK
5. Department of Medicine; McMaster University; Hamilton Canada
6. The Cure Parkinson's Trust; London UK
7. Department of Neurology; Lancashire Teaching Hospitals NHS Foundation Trust; Preston UK