1. Department of Biosystems Science and Engineering, ETH Zurich , Mattenstrasse 26 , Basel 4058, Switzerland
2. Institute of Microbiology, ETH Zurich , Vladimir-Prelog-Weg 4 , Zurich 8093, Switzerland
3. Center for Translational Immunology, University Medical Center Utrecht , Lundlaan 6 , Utrecht 3584 EA, The Netherlands
4. Department of Pathology and Immunology, University of Geneva , 24 rue du Général-Dufour , Geneva 1211, Switzerland