1. Navy Bureau of Medicine and Surgery , Falls Church, VA 22042, USA
2. National Institutes of Health, National Institute of Dental and Craniofacial Research , Bethesda, MD 20892, USA
3. Air Force Dental Research and Consultation Service , Fort Sam Houston, TX 78234, USA
4. Tri-Service Center for Oral Health Studies, Uniformed Services University-Southern Region , JBSA-Ft Sam Houston, TX 78234, USA
5. Present Address: Office of Regulatory Operations, Data Standard Branch , Center for Biologics Evaluation and Research, Food and Drug Administration, Silver Spring, MD 20993, USA
6. Department of Community Dentistry and Population Health, University of Colorado School of Dental Medicine , Aurora, CO 80045, USA