1. Department of Nephrology; Aalborg University Hospital; Aalborg Denmark
2. Medical Department; Oslo University Hospital Rikshospitalet; Oslo Norway
3. Vestfold Hospital Trust; Medical Clinic; Toensberg Norway
4. Institute of Cardiovascular and Medical Sciences; University of Glasgow; Glasgow UK
5. Division of Nephrology; Department of Internal Medicine; University of Uppsala; Uppsala Sweden
6. Department of Nephrology; Aarhus University Hospital; Aarhus Denmark