About the Authors
Division of Neuroimmunology, Institute of Experimental Immunology, Department of Pathology, University Hospital of Zurich, Zurich, Switzerland
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: MG JH BB. Performed the experiments: MG JH. Analyzed the data: MG JH BB. Wrote the paper: MG JH BB.