1 Rheumatology Department (C Twomey and AL Solebo), Great Ormond Street Hospital for Children NHS Trust, London, UK.
2 Division of Medicine, University College Cork School of Medicine (E McGonigle), Cork, Ireland; Ophthalmology Department (E McGonigle and AL Solebo), Great Ormond Street Hospital for Children NHS Trust, London, UK.
3 Rheumatology Department (C Twomey and AL Solebo), Great Ormond Street Hospital for Children NHS Trust, London, UK; Ophthalmology Department (E McGonigle and AL Solebo), Great Ormond Street Hospital for Children NHS Trust, London, UK; Population, Policy and Practice Programme (AL Solebo), UCL GOS Institute of Child Health, London, UK. Electronic address: a.solebo@ucl.ac.uk.