1 Department of Allergy, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom.
2 Department of Allergy, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom; Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, King's College London, London, United Kingdom.
3 Department of Allergy, Guy's Hospital, Guy's and St Thomas' NHS Foundation Trust, London, United Kingdom; Peter Gorer Department of Immunobiology, School of Immunology and Microbial Sciences, King's College London, London, United Kingdom. Electronic address: Leonard.Siew@gstt.nhs.uk.