1. Institute of Molecular Virology and Cell Biology, Friedrich Loeffler Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany
2. Institute of Diagnostic Virology, Friedrich Loeffler Institut, Federal Research Institute for Animal Health, Greifswald-Insel Riems, Germany
3. Institut Pasteur, Département de Virologie, Unité de Virologie Structurale, Paris, France