- Correspondence to: Dr Christopher J Klein, Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA;
- Received December 3, 2001
- Accepted March 4, 2002
- Revised February 14, 2002
- First published July 1, 2002.
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.