1. Ludwig Center for Cancer Immunotherapy, Howard Hughes Medical Institute, Department of Immunology, and Department of Neurology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021
2. Department of Immunology, Juntendo University School of Medicine, Tokyo 113-8421, Japan
3. Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892
4. Program in Molecular Microbiology and Immunology, Department of Pathology, University of Maryland School of Medicine, Baltimore, MD 21201