1. Dows Institute for Research, College of Dentistry, University of Iowa, Iowa City, IA, USA
2. Department of Health Management and Policy, College of Public Health, University of Iowa, Iowa City, IA, USA
3. Department of Anatomy and Cell Biology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA
4. Department of Orthodontics, College of Dentistry, University of Iowa, Iowa City, IA, USA
5. Department of Oral Pathology-Radiology and Medicine, University of Iowa, Iowa City, IA, USA