1 Nephrologist and professor, Department of Medicine, University of Alberta, Edmonton, Alta.
2 Associate clinical professor, Department of Family Medicine, McMaster University, Hamilton, Ont.
3 Senior investigator, Lady Davis Institute of the Jewish General Hospital; professor, Departments of Psychiatry; Epidemiology, Biostatistics, and Occupational Health; Medicine; Psychology; and Educational and Counselling Psychology, McGill University, Montréal, Que.