- Dr Fumihito Yoshii, Department of Neurology, Tokai University School of Medicine, Bohseidai, Isehara, Kanagawa 259–1193, Japan. Telephone 0081 463 93 1121; fax 0081 463 94 8764.
- Received 11 November 1997
- Revised 6 February 1998
- Accepted 16 February 1998
- Published online 1 September 1998.
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