- Dr Mario-Ubaldo Manto, Service de Neurologie, Fonds National de la Recherche Scientifique, Hôpital Erasme-ULB, 808 Route de Lennik, 1070 Bruxelles, Belgium. Telephone 0032 2 555 67 47; fax 0032 2 555 39 42.
- Received 13 August 1997
- Revised 19 February 1998
- Accepted 24 February 1998
- Published online 1 September 1998.
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