- Dr Alex Iranzo, Servei de Neurologia, Hospital Clinic, C/Villarroel 170, Barcelona 08036, Spain. Telephone 0034 3 2275413; fax 0034 3 2275454
- Received March 3, 1998
- Revised September 11, 1998
- Accepted September 22, 1998
- First published April 1, 1999.
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