- Correspondence to Dr Scott D Grosse, Centers for Disease Control and Prevention, 1600 Clifton Road, MS E64, Atlanta, GA 30333, USA;
- Accepted November 16, 2010
- First published January 17, 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.