- 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 3 November 1997
- Revised 16 February 1998
- Accepted 24 February 1998
- Published online 1 September 1998.
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