- Tom Lietman, MD, Francis I Proctor Foundation, University of California San Francisco, Box No 0944, San Francisco, CA 94143-0944, USA
- Accepted December 28, 2000
- First published April 1, 2001.
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.