- Correspondence to Dr Youlian Liao, Division of Adult and Community Health, Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, 4770 Buford Highway, NE, K-30, Atlanta, GA 30341, USA;
- Accepted May 20, 2009
- First published August 6, 2009.
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.