- Correspondence to: Dr Flavia di Michele, IRCCS Santa Lucia, via Ardeatina 306, 00179 Rome, Italy;
- Received August 27, 2002
- Accepted January 7, 2003
- Revised January 7, 2003
- First published May 1, 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.