1. Division of Oral Health, National Center for Chronic Disease and Health Promotion, Centers for Disease Control and Prevention (CDC), Rhodes Bldg, Mail Stop F-10, Atlanta, GA 30341, USA
2. The Ginn Group/Northrop Grumman
3. University of Michigan School of Dentistry, Ann Arbor, USA
4. National Center for Health Statistics, CDC, Hyattsville, MD, USA