Accepted for Publication: April 18, 2012.
Published Online: July 2, 2012. doi:10.1001/archneurol.2012.1472
Author Contributions:Study concept and design: Horvath and Chinnery. Acquisition of data: Pyle, Yu-Wai-Man, Eglon, Pickering-Brown, and Horvath. Analysis and interpretation of data: Pyle, Griffin, Yu-Wai-Man, Duff, Santibanez-Korev, Horvath, and Chinnery. Drafting of the manuscript: Pyle and Chinnery. Critical revision of the manuscript for important intellectual content: Pyle, Griffin, Yu-Wai-Man, Duff, Eglon, Pickering-Brown, Santibanez-Korev, Horvath, and Chinnery. Statistical analysis: Griffin. Obtained funding: Pickering-Brown and Chinnery. Administrative, technical, and material support: Yu-Wai-Man, Duff, Eglon, and Horvath. Study supervision: Pyle, Santibanez-Korev, and Chinnery.
Financial Disclosure: None reported.
Funding/Support: Dr Yu-Wai-Man is a Medical Research Council Clinician Scientist. Dr Pickering-Brown is a Medical Research Council Senior Nonclinical Fellow. Dr Horvath is supported by the Medical Research Council. Dr Chinnery is a Wellcome Trust Senior Fellow in Clinical Science and a National Institute for Health Research Senior Investigator and receives funding from the Medical Research Council, the UK Parkinson's Disease Society, and the National Institute for Health Research Biomedical Research Centre for Ageing and Age-Related Disease award to the Newcastle upon Tyne Foundation Hospitals National Health Service Trust.