[1] South Warwickshire Univ NHS Fdn Trust, Warwick, England
[2] Nottingham Univ Hosp NHS Trust, Nottingham, England
[3] Univ Nottingham, Ctr Evidence Based Dermatol, Nottingham, England
[4] Great Ormond St Hosp Sick Children, London, England
[5] Royal Surrey Cty Hosp, Guildford, England
[6] Oxford Univ Hosp NHS Fdn Trust, Oxford, England