1 Department of Clinical Pharmacology, Cambridge University Hospital NHS Foundation Trust, Cambridge, United Kingdom. Electronic address: ingni.lu@nhs.net.
2 Department of Allergy, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.
3 Clinical Immunology and Allergy Unit, Sheffield Teaching Hospital, Northern General Hospital, Sheffield, United Kingdom; Faculty of Science, Liverpool Hope University, Liverpool, United Kingdom.
4 Department of Allergy, Cambridge University Hospitals NHS Foundation Trust, Cambridge, United Kingdom.