1. Department of Community and Behavioral Health, College of Public Health, The University of Iowa, Iowa City, IA, USA
2. Health Promotion Research Center, University of Washington, Seattle, WA, USA
3. Department of Health Management and Policy, College of Public Health, The University of Iowa, Iowa City, IA, USA
4. Department of Sociology, The University of Iowa, Iowa City, IA, USA
5. Department of Biostatistics, College of Public Health, The University of Iowa, Iowa City, IA, USA