1. Department of Periodontics and Clinical Periodontal Research Laboratory; University of Washington; Seattle WA United States
2. Department of Biostatistics; University of Minnesota; Minneapolis MN United States
3. Department of Periodontics; University of Texas Health Science Center at Houston; Houston TX United States
4. Department of Periodontics; University of Minnesota; Minneapolis MN United States
5. Department of Diagnostic and Biological Sciences; University of Minnesota; Minneapolis MN United States