1. Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
2. Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, Pennsylvania, USA
3. Regenstrief Institute, Indianapolis, Indiana, USA
4. Department of Medicine, University of California, San Francisco, San Francisco, California, USA
5. Center for Clinical Informatics and Improvement Research, University of California, San Francisco, San Francisco, California, USA