- Dr MLC van Veelen, Department of Neurosurgery, Academic Hospital Rotterdam, Dr Molewaterplein 40, 3015 GD Rotterdam, The Netherlands. Telephone 0031 10 463 9222; Fax 0031 10 463 3735.
- Received September 12, 1996
- Revised August 15, 1997
- Accepted November 20, 1997
- First published May 1, 1998.
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