1. Kentucky Injury Prevention and Research Center, University of Kentucky, Lexington, KY, USA
2. Institute for Biomedical Informatics, University of Kentucky, Lexington, KY, USA
3. Department of Health Management and Policy, University of Kentucky, Lexington, KY, USA
4. School of Medicine, University of Washington, Seattle, WA, USA
5. Department of Biostatistics, University of Kentucky, Lexington, KY, USA