1. Private Practice Fullerton CA USA
2. The McGuire Institute, a Private Practice‐Based Clinical Research Network Houston TX USA
3. Private Practice Victoria TX USA
4. Private Practice Houston TX USA
5. Private Practice Richmond VA USA
6. Department of Periodontics Virginia Commonwealth School of Dentistry Richmond VA USA
7. Private Practice New London CT USA
8. Department of Periodontics University of Connecticut School of Dental Medicine Farmington CT USA
9. Department of Periodontology University of Alabama at Birmingham School of Dentistry Birmingham AL USA