1. Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC (S.M.Al-K., D.M.W., C.B.G., J.H.A., R.D.L.).
2. Uppsala Clinical Research Center and the Department of Medical Sciences, Cardiology, Uppsala University, Sweden (L.W., Z.H., C.H.).
3. Hematology Division, University of Washington, Seattle (D.A.G.).
4. University of Medicine and Pharmacy Carol Davila, University and Emergency Hospital, Bucharest, Romania (D.V.).
5. Division of Cardiology, University of Missouri, Columbia, MO (G.C.F.).
6. Boston University School of Medicine, Boston, MA (E.M.H.).