- Dr Francesc Graus, Servei de Neurologia, Hospital Clínic, Villarroel 170, Barcelona 08036. Spain. Telephone 0034 3 2272213; fax 0034 3 2275414; email
- Received March 9, 1998
- Revised September 3, 1998
- Accepted September 11, 1998
- First published February 1, 1999.
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