1. Department of Pathology University of Sherbrooke Sherbrooke Canada
2. Department of Pathology and Cellular Biology University of Montreal Montreal Quebec Canada
3. Department of Pathology, Microbiology and Immunology Vanderbilt University Medical Center Nashville TN USA
4. Department of Biostatistics University of Sherbrooke Sherbrooke Canada
5. Department of Surgery University of Sherbrooke Sherbrooke Canada