1 Health Economics Group, Norwich Medical School, University of East Anglia, Norwich, UK.
2 Unit for Paediatric and Population-based Dermatology Research, St John's Institute of Dermatology, Guy's and ST Thomas' NHS Foundation Trust and King's College London, London, UK.
3 Liverpool Clinical Trials Centre, University of Liverpool, Liverpool, UK.
4 Clinical Medicine, Trinity College Dublin, Dublin, Ireland.
5 Royal Hospital for Children, NHS Greater Glasgow and Clyde, Glasgow, UK.
6 Paediatric Dermatology, Our Lady's Children Hospital Crumlin, Dublin, Ireland.
7 Evelina Pharmacy, Guys' & St Thomas' NHS Foundation Trust, London, UK.
8 Institute of Pharmaceutical Science, King's College London, London, UK.