1. From the Department of Internal Medicine, Cardiovascular Research Center, University of Michigan Medical Center, Ann Arbor (Y.S., J.V., C.G., Y.F., Y.E.C., D.T.E.)
2. Department of Cardiovascular Medicine, The Second Xiangya Hospital, Central South University, Changsha, China (Y.S.).
3. Department of Cardiology, Peking University First Hospital, Beijing, China (J.L., Y.G.)
4. Department of Pharmacology, University of Michigan, Ann Arbor (H.Z.)