1. Center for Population Health Information Technology, Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
2. Institute for Clinical and Translational Research, Johns Hopkins Medical Institute, Baltimore, Maryland, USA
3. Kaiser Permanente Southern Caifornia, Pasadena, California, USA
4. Kaiser Permanente Mid-Atlantic States, Rockville, Maryland, USA
5. Department of Medicine Division of Health Sciences Informatics, Johns Hopkins School of Medicine, Baltimore, Maryland, USA