- Correspondence to Giulia Cesaroni, Department of Epidemiology, Lazio Regional Health Service, Via S. Costanza 53, 00198 Rome, Italy;
- Accepted June 8, 2011
- First published August 7, 2011.
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.