- Correspondence to: Dr M Koga, Department of Neurology, Dokkyo University School of Medicine, Kitakobayashi 880, Mibu, Shimotsuga, Tochigi, Japan;
- Received October 29, 2001
- Accepted February 27, 2002
- Revised January 16, 2002
- First published June 1, 2002.
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