1. Nephrology Research Laboratory, Nijmegen Center for Molecular Life Sciences,and Division of Nephrology University Medical Center, Nijmegen, The Netherlands
2. Nephrology Research Laboratory, Nijmegen Center for Molecular Life Sciences,and Division of Nephrology University Medical Center, Nijmegen, The Netherlands; Division of Nephrology (545), University Medical Center, PO Box 9101, 6500 HB Nijmegen, The Netherlands