1. Medicine A, University Hospital, CH-4031 Basel, Switzerland
2. University Health Network, Departments of Medical Biophysics and Immunology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
3. Department of Pathology, University Hospital, CH-8091 Zurich, Switzerland
4. Molecular Biomedicine, Swiss Federal Institute of Technology, CH-8952 Zurich, Switzerland
5. IMBA, Institute for Molecular Biotechnology of the Austrian Academy of Sciences, A-1030 Vienna, Austria