1. Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
2. Division of Protective Immunity and Division of Cancer Pathobiology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104;
3. Department of Molecular Biology, Medical Biochemistry, and Pathology, Faculty of Medicine, Université Laval, Québec G1V 0A6, Canada;
4. CHU de Québec Research Center–Université Laval (L'Hôtel-Dieu de Québec), Cancer Research Center, Québec G1R 2J6, Canada