1. Private practice, Tucson, Arizona, clinical professor, University of Southern California School of Dentistry, Department of Graduate Periodontics, affiliate professor, Department of Graduate Periodontics, University of Washington, Seattle, WA, USA;
2. private practice, Tucson, AZ, USA;
3. professor, Department of Dental Public Health Sciences, University of Washington, Seattle, WA, USA;
4. graduate student, The Hebrew University‐Hadassah, The Center for Graduate Studies in Prosthodontics, Jerusalem, Israel;
5. director, Postgraduate Periodontology, Faculty of Dental Medicine, Hadassah‐Hebrew University Medical Center, Jerusalem, Israel;
6. director, The Hebrew University‐Hadassah, Head, the Center for Graduate Studies in Prosthodontics, Jerusalem, Israel [Correction added to online publication 24 January 2011]