Conflict of Interest Disclosures: None reported.
Funding/Support: This study was supported by National Institutes of Health grant AG032958 (Drs Gilden and Nagel).
Role of the Funder/Sponsor: The National Institutes of Health 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.
Additional Contributions: We thank Marina Hoffman, BA, for editorial assistance and Cathy Allen for word processing and formatting. They did not receive compensation from a funding sponsor for their contributions.