1. Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
2. Regenstrief Institute Inc., Indianapolis, IN 46202, USA.
3. Marshfield Clinic Research Foundation, Marshfield, WI 54449, USA.
4. Group Health Research Institute, Seattle, WA 98101, USA.
5. School of Public Health, University of Washington, Seattle, WA 98104, USA.
6. School of Medicine, University of Washington, Seattle, WA 98104, USA.
7. Department of Health Sciences Research, Mayo Clinic, Rochester, MN 55905, USA.
8. Department of Internal Medicine, Mayo Clinic, Rochester, MN 55905, USA.
9. Office of Population Genomics, National Human Genome Research Institute, Bethesda, MD 20892–2152, USA.
10. Departments of Biomedical Informatics and Medicine, Vanderbilt University, Nashville, TN 37232, USA.