1. University Hospital Würzburg; Department of Medicine I, Division of Nephrology; Oberdürrbacher Str. 6 Würzburg Germany 97080
2. University of Würzburg; Institute of Clinical Epidemiology and Biometry; Würzburg Germany
3. Tufts Medical Center; Institute for Clinical Research and Health Policy Studies; 800 Washington St Boston MA USA 02113
4. The University of Sydney; Sydney School of Public Health; Edward Ford Building A27 Sydney NSW Australia 2006
5. The University of Sydney at Westmead; Centre for Transplant and Renal Research, Westmead Millennium Institute; Westmead NSW Australia 2145
6. The Children's Hospital at Westmead; Cochrane Kidney and Transplant, Centre for Kidney Research; Westmead NSW Australia 2145
7. Brown University School of Public Health; Center for Evidence-based Medicine; Providence RI USA 02912
8. Tufts University School of Medicine; Department of Medicine, Division of Nephrology; 750 Washington St Box 391 Boston MA USA 02111