1. Department of Clinical Infection, Microbiology and Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
2. ENT Department, Alder Hey Children's Hospital, Liverpool, United Kingdom
3. ENT Department, Royal Liverpool and Broadgreen University Hospitals, Liverpool, United Kingdom
4. ENT Department, Aintree University Hospital of Liverpool, Liverpool, United Kingdom
5. Institute in the Park, Alder Hey Children's Hospital, Liverpool, United Kingdom
6. Liverpool School of Tropical Medicine, Liverpool, United Kingdom