This is an observational study.

Change from baseline in the MDS-UPDRS. The MDS-UPDRS contains 4 subscales: Part I, non-motor aspects of experiences of daily living (13 items); Part II, motor aspects of experiences of daily living (13 items); Part III, motor examination (33 scores based on 18 items); Part IV, motor complications (6 items). The rating for each item, or sub-item, is from 0 (normal) to 4 (severe). The total score for each Part is obtained from the sum of the corresponding item scores.

Change from baseline in the Unified Multiple System Atrophy Rating Scale (UMSARS) and compared to placebo. UMSARS total scores range from 0-104 points with higher scores indicating greater severity of impairment.

Change from baseline in the Parkinson's Disease Questionnaire (PDQ-39). PDQ-39 is a self-reported 39-item questionnaire designed to measure health related quality of life in Parkinson's Disease patients. It provides scores in 8 domains: mobility, activities of daily living, emotions, stigma, social support, cognitive function, bodily discomfort and communication, as well as a summary index score for quality of life.