- Dr Leonard H van den Berg, Department of Neurology, University Hospital Utrecht, PO Box 85500, 3508 GA Utrecht, The Netherlands.
- Received July 17, 1996
- Revised May 8, 1997
- Accepted May 14, 1997
- First published November 1, 1997.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.