1. Novartis Institutes for Biomedical Research, Cambridge, MA 02139, USA
2. Center for Cellular Immunotherapies, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
3. China Novartis Institutes for Biomedical Research, Shanghai 201203, China
4. Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA