1. Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
2. Division of Virology, National Institute for Biological Standards and Control (NIBSC), Hertfordshire, United Kingdom
3. Division of Structural Biology, Wellcome Centre for Human Genetics, University of Oxford, Oxford, United Kingdom
4. Department of Infectious Diseases, School of Immunology and Microbial Sciences, King's College London, United Kingdom