Department of Endocrinology and Nephrology, Nordsjællands Hospital, Hillerød, Denmark. Department of Nephrology, Herlev and Gentofte Hospital, Herlev, Denmark. Calciscon AG, Nidau, Switzerland. Insitute for Physiology and Pathophysiology, Johannes Kepler University Linz, Linz, Austria. Department of Nephrology, Royal Melbourne Hospital, University of Melbourne, Melbourne, Victoria, Australia. Department of Medicine, Royal Melbourne Hospital, University of Melbourne, Melbourne, Victoria, Australia. Department of Cardiology, Herlev and Gentofte Hospital, Herlev, Denmark.