- Dr Ichiro Nakashima, Department of Neurology, Tohoku University School of Medicine, 1–1 Seiryo-machi, Aoba-ku, Sendai 980–8574, Japan. Telephone 0081 22 717 7189; fax 0081 22 717 7192; email
- Received October 12, 1998
- Revised January 25, 1999
- Accepted February 23, 1999
- First published August 1, 1999.
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