- Correspondence to: Dr A Gerritsen, Institute for Research in Extramural Medicine, VU University Medical Centre, Van der Boechorststraat 7, 1081 BT Amsterdam, the Netherlands;
- Received August 7, 2002
- Revised March 21, 2003
- First published August 21, 2003.
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.