1. Department of Epidemiology, Center of Molecular and Clinical Epidemiology of Infectious Diseases, School of Public Health, University of Michigan, Ann Arbor, Michigan, USA.
2. Department of Oral and Craniofacial Sciences, Center for Craniofacial and Dental Genetics, School of Dental Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
3. Department of Human Genetics, School of Public Health, University of Pittsburgh, Pennsylvania, Pennsylvania, USA.
4. Department of Community Dentistry and Behavioral Science, College of Dentistry, University of Florida, Gainesville, Florida, USA.
5. Clinical Translational Science, School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.