1. Department of Epidemiology and Biostatistics, University of South Carolina Arnold School of Public Health, Columbia, SC, USA
2. Division of Research and Statistics, South Carolina Revenue and Fiscal Affairs, Columbia, SC, USA
3. Department of Family and Preventive Medicine, University of South Carolina School of Medicine, Columbia, SC, USA
4. Department of Economics, University of South Carolina, Moore School of Business, Columbia, SC, USA
5. Centers for Disease Control and Prevention, National Center on Birth Defects and Developmental Disabilities, Atlanta, GA, USA