- Dr ISJ Martina, Department of Neurology, University Hospital Rotterdam, Dr Molewaterplein 40, 3015 GD Rotterdam, The Netherlands. Telephone 0031 10 4639222; fax 0031 10 4633208.
- Received December 2, 1997
- Revised April 1, 1998
- Accepted April 6, 1998
- First published November 1, 1998.
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