*Renal Research Group, Institute of Medicine, University of Bergen, Bergen, Norway;
†Department of Medicine, Haukeland University Hospital, Bergen, Norway;
‡The Medical Birth Registry of Norway, Norwegian Institute of Public Health, Bergen, Norway;
§Department of Public Health and Primary Health Care, University of Bergen, Bergen, Norway;
‖Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts;
¶Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts; and
**The Norwegian Renal Registry, Section of Nephrology, Department of Transplantation Medicine, Rikshospitalet, Oslo University Hospital, Oslo, Norway
Correspondence: Dr. Bjørn Egil Vikse, Renal Research Group, Institute of Medicine, Haukeland University Hospital, 5021 Bergen, Norway. Email: [email protected]
Received February 21, 2012
Accepted July 9, 2012
