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Footnotes
CHW-G and RAB are joint senior last authors.
Contributors JRE wrote the manuscript which was reviewed and revised by the other authors. JRE, GCC and DPB performed data collection for the PICNICS study, and TF, CHW-G and SLM performed data collection for the CamPAiGN Study. Data analysis was performed by JRE (PICNICS) and TF and CHW-G (CamPaiGN).
Funding Cure Parkinson’s Trust; Van Geest Foundation; Medical Research Council (RG38582); Parkinson’s UK (RG39906); National Institute of Health Research Biomedical Research Centre Award to the University of Cambridge.
Competing interests None declared.
Ethics approval Essex 2 REC and Cambridgeshire 2 REC.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement The authors would be happy to consider collaboration and the sharing of longitudinal data with researchers working in the fields of PD natural history or biomarkers of progression in PD.