- Correspondence to: B J M de Swart Neuromuscular Centre Nijmegen, Institute of Neurology, University Medical Centre Nijmegen, PO Box 9101, 6500 HB Nijmegen, Netherlands;
- Received November 10, 2003
- Accepted December 21, 2003
- Revised December 19, 2003
- First published September 16, 2004.
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