- Dr Maurizio Versino, Dipartimento Scienze Neurologiche, Università di Pavia, Fondazione IRCCS Istituto Neurologico C Mondino, Via Palestro 3, 27100 Pavia, Italy email
- Received May 20, 1999
- Revised August 9, 1999
- Accepted September 17, 1999
- First published February 1, 2000.
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