1. Robert D and Patricia E Kern Center for the Science of Health Care Delivery, Mayo Clinic, Rochester, Minnesota.
2. Division of Primary Care Internal Medicine, Department of Medicine, Mayo Clinic, Rochester, Minnesota.
3. Division of Health Care Policy and Research, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota.
4. Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota.
5. Division of Biomedical Statistics and Informatics, Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota.