1. Department of Medical Biochemistry and Pharmacology & Department of Heart Disease, Haukeland University Hospital, Bergen, Norway (K.M.A.).
2. Department of Clinical Science, University of Bergen, Norway (K.M.A.).
3. Central Diagnostic Laboratory, Maastricht University Medical Center, the Netherlands (S.J.R.M.).
4. CARIM School for Cardiovascular Diseases, Maastricht University, the Netherlands (S.J.R.M.).
5. BHF Centre for Cardiovascular Science (N.L.M.), University of Edinburgh, UK.
6. Usher Institute (N.L.M.), University of Edinburgh, UK.