1. From the Department of Circulation and Medical Imaging (H.D., A.T., S.A.A., A.S.) and Department of Public Health (L.J.V.), Norwegian University of Science and Technology, Trondheim, Norway; Department of Medicine (H.D.), Levanger Hospital, Nord-Trøndelag Health Trust, Nord-Trøndelag, Norway; and Department of Cardiology (A.S.), St Olavs Hospital/Trondheim University Hospital, Trondheim, Norway.