Accepted for Publication: June 3, 2014.
Published Online: October 20, 2014. doi:10.1001/jamaneurol.2014.1931.
Study concept and design: Hodges, Piguet.
Acquisition, analysis, or interpretation of data: Ahmed, Irish, Kam, van Keizerswaard, Bartley, Samaras, Piguet.
Drafting of the manuscript: Ahmed, Irish, Kam, van Keizerswaard, Bartley, Samaras, Piguet.
Critical revision of the manuscript for important intellectual content: Ahmed, Hodges, Piguet.
Statistical analysis: Ahmed, Irish, Kam, van Keizerswaard, Bartley, Samaras.
Obtained funding: Piguet.
Study supervision: Hodges, Piguet.
Conflict of Interest Disclosures: None reported.
Funding/Support: This work was supported by a National Health and Medical Research Council (NHMRC) project grant (1003139), the Australian Research Council (ARC) Centre of Excellence in Cognition and its Disorders (CE110001021), a Royal Australasian College of Physicians scholarship and MND Australia scholarship (Dr Ahmed), an ARC Discovery Early Career Research Award (DE130100463) (Dr Irish), an ARC Federation Fellowship (FF0776229) (Dr Hodges), and an NHMRC of Australia Career Development Fellowship (APP1022684) (Dr Piguet).
Role of the Funder/Sponsor: The funding sources had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.