1. Department of Periodontics and Oral Medicine; School of Dentistry; University of Michigan; Ann Arbor MI USA
2. Department of Pathology; Medical School; University of Michigan; Ann Arbor MI USA
3. Department of Statistics; Florida State University; Tallahassee FL USA
4. Department of Craniofacial Biology and Center for Oral Health Research; Medical University of South Carolina; Charleston SC USA
5. Department of Microbiology and Immunology; Medical University of South Carolina; Charleston SC USA