Acknowledgments: The investigators would like to thank all the patients and families who gave generously of their time to be part of this study. Thanks also to research assistants Barb Atwater, Beryl Ferguson, Jan O'Brien, and Kris Gustavson for their valuable assistance. A special thank you to the Kidney Foundation of Canada, Allied Health Scientific Committee, for the financial support that helped to make this study a reality.
Note: Article submitted July 1998; accepted July 1999.