1 Infectious Diseases, Department of Infection, Immunity and Cardiovascular Disease, University of Sheffield Medical School, Sheffield; Department of Infection and Tropical Medicine, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield.
2 Academic Unit of Primary Care, University of Sheffield, Sheffield.
3 Department of Infection and Tropical Medicine, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield; Department of Virology, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield.
4 Department of Infection and Tropical Medicine, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield.