1. Service of Nephrology, Inselspital, 3010 Bern, Switzerland
2. Division of Intensive Care, University Hospital of Geneva, 1205 Geneva, Switzerland
3. Calciscon AG, 2503 Biel, Switzerland
4. Department of Physiology and Pathophysiology, Johannes Kepler University, 4040 Linz, Austria
5. Service of Internal Medicine, Hospital La Chaux-de-Fonds, 2000 Neuchatel, Switzerland
6. Division of Nephrology, Johns Hopkins University School of Medicine, Baltimore, MD 21218, USA
7. Service of Nephrology, Department of Internal Medicine Specialties, University Hospital of Geneva, 1205 Geneva, Switzerland