1. Department of Preventive and Community Dentistry University of Iowa College of Dentistry Iowa City Iowa USA
2. Oral Science University of Iowa College of Dentistry Iowa City Iowa USA
3. University of Iowa College of Dentistry Iowa City Iowa USA
4. University of Washington College of Arts and Sciences Seattle Washington USA
5. University of Washington School of Dentistry Seattle Washington USA
6. Department of Oral Health Sciences University of Washington School of Dentistry Seattle Washington USA