Study protocol: Care of Late-Stage Parkinsonism (CLaSP): a longitudinal cohort study
Background: Parkinson's disease (PD) is a chronic progressive disorder leading to increasing disability. While the symptoms and needs of patients in the early stages of their disease are well characterized, little information is available on patients in the late stage of the disease. Methods/design: The Care of Late-Stage Parkinsonism (CLaSP) study is a longitudinal, multicenter, prospective cohor