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Dr. Xu is a biostatistician and Clinician Scientist at the Princess Margaret Cancer Centre, and a Professor in Biostatistics at the University of Toronto's Dalla Lana School of Public Health. As Principal Investigator or co-Investigator, he has been involved in study design, data administration, statistical modelling development and data analysis on different clinical research and human genetic studies. He has published over 450 peer-reviewed papers in the fields of statistics, bioinformatics, medical science and human genetics.