- Correspondence to:
Professor R Burgos-Vargas
Hospital General de México, Dr Balmis 148, México DF 06726;
- Accepted December 19, 2003
- First published September 10, 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.