1. Department of Nephrology, Hypertension and Clinical Pharmacology; Inselspital Bern University Hospital; University of Bern; Bern Switzerland
2. Department of Internal Medicine; Division of Nephrology and Hypertension; University of Lausanne; Lausanne Switzerland
3. Department of Internal Medicine and Geriatrics; Division of Neurology; Valais Hospital; Sion Switzerland
4. Department of Laboratories; Division of Clinical Pharmacology; University Hospital of Lausanne; University of Lausanne; Lausanne Switzerland