- Correspondence to: Joseph R DiFranza MD Department of Family Medicine and Community Health, 55 Lake Avenue, University of Massachusetts Medical School, Worcester, Massachusetts 01655, USA;
- Received 20 July 2004
- Accepted 6 January 2005
- Published online 24 March 2005.
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.