Labarthe Darwin R, Biggers Alana, LaPier Timothy, George Mary G
National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia 30341, USA.
Am J Prev Med. 2006 Dec;31(6 Suppl 2):S192-5. doi: 10.1016/j.amepre.2006.07.027.