1 Department of Respiratory and Sleep Medicine, Royal Hospital for Children, Glasgow G51 4TF, UK.
2 Department of Respiratory and Sleep Medicine, Royal Hospital for Children and Young People, Edinburgh, UK; Department of Child Life and Health, University of Edinburgh, Edinburgh, UK.
3 Department of Paediatric Surgery, Royal Hospital for Children, Glasgow, UK.
4 Scottish Microbiology Reference Laboratories, Glasgow Royal Infirmary, Glasgow, UK.
5 Microbiology Department, Queen Elizabeth University Hospital, Glasgow, UK.
6 Microbiology Department, Royal Infirmary of Edinburgh, Edinburgh, UK.
7 Department of Paediatrics, Royal Aberdeen Children's Hospital, Aberdeen, UK.
8 Department of Microbiology, Aberdeen Royal Infirmary, Aberdeen, UK.
9 Department of Paediatric Surgery, Royal Hospital for Children, Glasgow, UK; Scottish Microbiology Reference Laboratories, Glasgow Royal Infirmary, Glasgow, UK.
10 College of Medical, Veterinary and Life Sciences, Glasgow Dental School, University of Glasgow, Glasgow, UK.
11 Department of Paediatric Infectious Diseases and Immunology, Royal Hospital for Children, Glasgow, UK.
12 Department of Respiratory and Sleep Medicine, Royal Hospital for Children, Glasgow G51 4TF, UK; Maternal and Child Health, University of Glasgow, Glasgow, UK.
13 Department of Respiratory and Sleep Medicine, Royal Hospital for Children, Glasgow G51 4TF, UK; Department of Child Life and Health, University of Edinburgh, Edinburgh, UK. Electronic address: thomas.christie.williams@ed.ac.uk.