1 Child Life and Health, University of Edinburgh, Edinburgh EH16 4TJ, UK; Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK. Electronic address: thomas.christie.william@ed.ac.uk.
2 Emergency Department, Bristol Royal Hospital for Children, Bristol, UK.
3 Child Life and Health, University of Edinburgh, Edinburgh EH16 4TJ, UK; Centre for Inflammation Research, University of Edinburgh, Edinburgh EH16 4TJ, UK; Department of Paediatric Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK.
4 Oxford Vaccine Group, Department of Paediatrics, University of Oxford, Oxford, UK; NIHR Oxford Biomedical Research Centre, University of Oxford, Oxford, UK.
5 Wellcome-Wolfson Institute for Experimental Medicine at Queen's University Belfast, Belfast, UK.
6 Department of Anthropology, University College London, London, UK.
7 Oxford Vaccine Group, Department of Paediatrics, University of Oxford, Oxford, UK.
8 Emergency Department, Bristol Royal Hospital for Children, Bristol, UK; Research in Emergency Care Avon Collaborative Hub (REACH), University of the West of England, Bristol, UK.
9 Child Life and Health, University of Edinburgh, Edinburgh EH16 4TJ, UK.
10 Paediatric Emergency Medicine Leicester Academic (PEMLA) Group, Leicester Royal Infirmary, Leicester, UK; Sapphire Group, Population Health Sciences, University of Leicester, Leicester LE1 5WW, UK. Electronic address: dr98@leicester.ac.uk.
11 Royal Aberdeen Children's Hospital.
12 Addenbrooke's Hospital.
13 Alder Hey Children's Hospital NHS Foundation Trust.
14 Barnet Hospital.
15 Bart's Health.
16 Northumbria Healthcare NHS Foundation Trust.
17 Bristol Royal Hospital for Children.
18 Colchester Hospital.
19 Countess of Chester NHS Foundation Trust.
20 Crosshouse Hospital (Kilmarnock).
21 Doncaster and Bassetlaw.
22 East Cheshire NHS Trust.
23 RHCYP Edinburgh.
24 Evelina London Children's Hospital.
25 St George's University Hospitals NHS Foundation Trust.
26 RHC Glasgow.
27 Leicester Royal Infirmary.
28 Leighton Hospital, Mid-Cheshire.
29 Medway Hospital NHS Foundation Trust.
30 Ninewells Hospital, Dundee.
31 Northern Lincolnshire and Goole.
32 Ormskirk & District General Hospital.
33 Oxford Children's Hospital.
34 Poole Hospital.
35 Royal Derby Hospital.
36 Royal Free Hospital.
37 Rotherham NHS Foundation Trust.
38 Salisbury NHS Foundation Trust.
39 Sheffield Children's NHS Foundation Trust.
40 Sunderland Royal Hospital.
41 St Helens & Knowsley NHS Trust.
42 Watford General Hospital (West Hertfordshire Teaching Hospitals NHS Trust).