- Dr Giovanni Defazio, Institute of Neurology of the University of Bari, Piazza Giulio Cesare 11, I-70124 Bari, Italy. Telephone 0039 80 5478511; fax 0039 80 5478532.
- Received March 20, 1997
- Revised June 13, 1997
- Accepted June 30, 1997
- First published January 1, 1998.
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