1. Department of Archaeogenetics, Max Planck Institute for the Science of Human History, Jena, Germany
2. Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA
3. Department of Periodontology, Trinity College, Dublin, Ireland
4. NIH Clinical Center, Bethesda, MD, USA
5. Clinical Center Nursing Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA
6. Center for Oral Health Research, University of Kentucky College of Dentistry, Lexington, KY, USA