1. 1Department of Pediatrics, College of Medicine, The University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma.
2. 2Department of Medical Informatics, The University of Oklahoma School of Community Medicine, Oklahoma City, Oklahoma.
3. 3Department of Epidemiology and Biostatistics, College of Public Health, The University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma.
4. 4The University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma.
5. 5Department of Medicine, Duke University School of Medicine, Durham, North Carolina.