1. Department of Preventive and Community Dentistry, College of Dentistry, University of Iowa, Iowa City, IA, USA
2. Faculty of Dentistry, University of Toronto, Toronto, Canada
3. Roy J. and Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA
4. College of Nursing, University of Iowa, Iowa City, IA, USA
5. College of Dentistry, University of Iowa, Iowa City, IA, USA