Fig. 1

Flowchart of the enrolment of the study population. a Dementia with Lewy Bodies (ICD-9-CM: 331.82), PD (ICD-9-CM: 332.0x), Corticobasal Degeneration (ICD-9-CM: 331.6x), Multiple System Atrophy and Progressive Supranuclear Palsy (ICD-9-CM:333.0), secondary parkinsonism (ICD-9-CM: 332.1) and essential tremor (ICD-9-CM: 333.1x)