1. From the Department of Cardiology, the Heart Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark (M.J.A., M.E., J.B-J., F.G., C.H., L.K., S.B., J.K., J.E.M.); and Division of Cardiovascular Diseases, Department of Medicine, Mayo Clinic, Rochester, MN (B.A.B.).