- Dr DSM Molenaar, Department of Neurology (H2–214), Academic Medical Center, PO Box 22700, 1100 DE Amsterdam, The Netherlands. Telephone 0031 20 5663546; fax 0031 20 6971438; email
- Received May 19, 1997
- Revised July 22, 1997
- Accepted July 29, 1997
- First published January 1, 1998.
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