1. Department of Family Medicine, Indiana University School of Medicine , Indianapolis, Indiana, USA
2. Regenstrief Institute, Center for Biomedical Informatics , Indianapolis, Indiana, USA
3. Department of Pediatrics, Indiana University School of Medicine , Indianapolis, Indiana, USA
4. Pew Charitable Trust , Baltimore, Maryland, USA
5. Department of Biostatistics, IU Richard M. Fairbanks School of Public Health , Indianapolis, Indiana, USA