1. Department of Medicine University of California San Diego La Jolla California USA
2. VA San Diego Healthcare System San Diego California USA
3. Department of Tumor Immunology Radboud Institute for Molecular Life Sciences Radboud University Medical Center Nijmegen The Netherlands
4. Department of Molecular Immunology and Microbiology Groningen Biomolecular Sciences and Biotechnology Institute University of Groningen Groningen The Netherlands