- Correspondence to: Professor N D Stafford Postgraduate Medical Institute, Cohen Building, Room 267, The University of Hull, Cottingham Road, Hull HU6 7RX, UK;
- Accepted April 7, 2003
- First published January 27, 2004.
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.