1. From the Department of Internal Medicine (B.A.M., S.Z.G., B.S.A., P.B.S., J.M.K., D.K.R.), Division of Cardiovascular Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, Mass; and the Department of Internal Medicine (A.C.S.), Division of Cardiology, Massachusetts General Hospital and Harvard Medical School, Boston, Mass.