Affiliation: | a Division of Cardiovascular Diseases, Mayo Clinic College of Medicine and Mayo Clinic Foundation, Rochester, MN b Department of Laboratory Medicine and Pathology, Mayo Clinic College of Medicine and Mayo Clinic Foundation, Rochester, MN c Office of Biostatistics Research, NHLBI, Bethesda, MD d Duke University School of Medicine, Durham, NC e Washington University School of Medicine, St. Louis, MO f Yale University School of Medicine, New Haven, CT, and Columbia University School of Medicine, New York, NY g University of Florida School of Medicine, Gainesville, FL h University of Alabama School of Medicine, Birmingham, AL |