1. Department of Rheumatology, Royal Devon and Exeter Hospital, Barrack Road, Exeter, UK
2. Department of Virology, Public Health England, Bristol, UK
3. Department of Virology, United Hospitals Bristol, NHS Foundation Trust, Bristol, UK
4. Department of Infectious Diseases, North Manchester General Hospital, Manchester, UK
5. Department of Rheumatology, King’s College London, London, UK