- Dr Radek Ptak, Division of Neuropsychological Rehabilitation, Department of Neurology, University Hospital, CH-3010 Bern, Switzerland. Telephone 0041 31 6324729; fax 0041 31 6329770.
- Received November 3, 1997
- Revised February 16, 1998
- Accepted February 24, 1998
- First published September 1, 1998.
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