1. Department of Periodontology School of Dentistry University of Alabama Birmingham Alabama USA
2. School of Dental Medicine Harvard University Birmingham Alabama USA
3. Department of Periodontology School of Dentistry University of California Los Angeles California USA
4. Department of Periodontology University of Missouri Kansas City Missouri USA
5. Arthur A. Dugoni School of Dentistry University of the Pacific Stockton California USA
6. Department of Dentistry Beckman Laser Institute and Medical Center University of California Irvine California USA
7. Department of Ecology and Evolutionary Biology University of California Irvine Irvine California USA