- Dr Wolf Muellbacher, Second Department of Neurology, Neurological Hospital of Vienna, Rosenhuegel, Riedelgasse 5, 1130 Vienna, Austria. Telephone 0043 1 88000 266; fax 0043 1 88000 384.
- Received January 27, 1998
- Revised April 29, 1998
- Accepted May 15, 1998
- First published November 1, 1998.
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