1. Department of Preventive and Community Dentistry; College of Dentistry; Public Policy Center; University of Iowa; Iowa City IA USA
2. Public Policy Center; University of Iowa; Iowa City IA USA
3. Department of Preventive and Community Dentistry; College of Dentistry; University of Iowa; Iowa City IA USA
4. Urban and Regional Planning; Department of Civil and Environmental Engineering; Public Policy Center; University of Iowa; Iowa City IA USA
5. Department of Biostatistics; College of Public Health; University of Iowa; Iowa City IA USA