1. Merck & Co., Inc. Kenilworth New Jersey USA
2. Critical Path Institute Tucson Arizona USA
3. Pfizer Groton Connecticut USA
4. Parkinson's UK London UK
5. UCB Brussels Belgium
6. Lundbeck Copenhagen Denmark
7. GSK UK Uxbridge UK
8. Biogen Cambridge Massachusetts USA
9. Denali Therapeutics Inc. San Francisco California USA
10. Incidence of Cognitive Impairment in Cohorts with Longitudinal Evaluation in Parkinson's Disease Newcastle University Newcastle upon Tyne UK
11. Institute of Neurodegenerative Diseases New Haven Connecticut USA
12. University of Rochester Rochester New York USA