- Correspondence to: Dr F B Horak, PT Neurological Sciences Institute of Oregon Health & Science University, West Campus – Bldg 1, 505 NW 185th Avenue Beaverton, OR 97006-3499, USA;
- Received March 18, 2002
- Accepted November 21, 2002
- Revised July 26, 2002
- First published May 1, 2003.
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