1. Department of Cardiology (M.S., M.J., A.A.H., T.B.L., A.G.O., P.B.N.), Aalborg University Hospital, Denmark.
2. Danish Center for Health Services Research (M.S., A.A.H., A.G.O., G.Y.H.L., P.B.N.), Aalborg University Hospital, Denmark.
3. Liverpool Centre for Cardiovascular Science at University of Liverpool, Liverpool John Moores University and Liverpool Heart and Chest Hospital, United Kingdom (G.Y.H.L.).