1. Department of Health Economics University of Birmingham Birmingham UK
2. Department of Immunology University Hospital of North Midlands NHS Trust Stoke‐on‐Trent UK
3. Institute of Applied Health Research University of Birmingham Birmingham UK
4. Department of Paediatric Immunodeficiency and Allergy Birmingham Heartlands Hospital NHS Trust Birmingham UK
5. Department of Paediatric Respiratory Medicine Royal Shrewsbury and Telford Hospitals NHS Trust Shrewsbury UK