- Dr A Lagueny, Service de Neurologie, Hopital du Haut-Leveque, USN, Avenue de Magellan, 33604 Pessac, France. Telephone 0033 556 420; fax 0033 556 815.
- Received 23 September 1997
- Revised 25 November 1997
- Accepted 19 February 1998
- Published online 1 September 1998.
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