Author Contributions: Drs Luft, Whitall, and
Hanley had full access to all of the data in the study and take responsibility
for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Luft, Waller, Whitall,
Macko, Goldberg, Hanley.
Acquisition of data: Luft, Waller, Whitall,
Analysis and interpretation of data: Luft,
Macko,Sorkin, Schulz, Goldberg, Waller, Whitall, Hanley.
Drafting of the manuscript: Luft, Macko, Waller,
Whitall, Macko, Goldberg, Hanley.
Critical revision of the manuscript for important
intellectual content: Luft, Waller, Whitall, Forrester, Macko, Sorkin,
Schulz, Goldberg, Hanley.
Statistical analysis: Luft, Sorkin.
Obtained funding: Luft, Whitall, Goldberg,
Administrative, technical, or material support:
Waller, Whitall, Forrester, Sorkin, Hanley.
Study supervision: Luft, Waller, Whitall, Forrester.
Funding/Support: This study was funded by National
Institutes of Health grants from the National Institute on Aging (P60AG 12583);
University of Maryland Claude D. Pepper Older Americans Independence Center,
National Institute on Disability and Rehabilitation Research (H133G010111);
the Baltimore Department of Veterans Affairs Geriatrics Research, Education
and Clinical Center (GRECC); National Institute of Neurological Disorders
and Stroke 1RO1 NS 24282-08; the France-Merrick Foundation; the Johns Hopkins
GCRC (NCRR MO1-00052); and the Eleanor Naylor Dana Charitable Trust, Deutsche
Forschungsgemeinschaft (Lu 748/2, 748/3).
Role of the Sponsors: None of the funding agencies
had any role in the design and conduct of the study; the collection, management,
analysis, and interpretation of the data; or in the preparation of the manuscript.
Acknowledgment: We thank Jim Boyd, BA, Christina
Stephenson, MPT, and Jill England, PTA, BS, for their support. We thank the
F. M. Kirby Centre for Functional Brain Imaging, Kennedy Krieger Institute,
and its staff, especially Terry Brawner, BS, and James Pekar, PhD.