1. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia2Department of Biostatistics and Epidemiology, University of Pennsylvania3Department of Medicine, University of Pennsylvania
2. Division of Research, Kaiser Permanente Northern California, Oakland
3. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia2Department of Biostatistics and Epidemiology, University of Pennsylvania5Rutgers Biomedical and Health Sciences, New Brunswick, New Jersey
4. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia2Department of Biostatistics and Epidemiology, University of Pennsylvania
5. Department of Medicine, University of Pennsylvania
6. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania, Philadelphia