1. York and Scarborough Teaching Hospitals NHS Foundation Trust, Wigginton Road, York, YO31 8HE, UK
2. York Trials Unit, Department of Health Sciences, ARRC Building, University of York, Heslington, York, YO10 5DD, UK
3. High Containment Microbiology, United Kingdom Health Security Agency, 61 Colindale Avenue, Colindale, London, NW9 5EQ, UK