1. Center of Molecular and Clinical Epidemiology of Infectious Diseases, Department of Epidemiology University of Michigan School of Public Health Ann Arbor Michigan USA
2. Center for Craniofacial and Dental Genetics University of Pittsburgh Pittsburgh Pennsylvania USA
3. Departments of Psychology and Dental Practice & Rural Health, and Center for Oral Health Research in Appalachia West Virginia University Morgantown West Virginia USA
4. Department of Oral and Craniofacial Sciences, School of Dental Medicine University of Pittsburgh Pittsburgh Pennsylvania USA
5. Department of Human Genetics, Graduate School of Public Health University of Pittsburgh Pittsburgh Pennsylvania USA
6. Clinical and Translational Science, School of Medicine University of Pittsburgh Pittsburgh Pennsylvania USA