- Correspondence to: Joseph R DiFranza MD, Department of Family Medicine and Community Health, University of Massachusetts Medical School, 55 Lake Avenue, Worcester, Massachusetts 01655, USA;
- Received September 27, 2001
- Accepted March 11, 2002
- Revised January 28, 2002
- First published September 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.