1 Centre for Endocrinology, William Harvey Research Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK.
2 Department of Paediatric Endocrinology, Barts Health NHS Trust, London, UK.
3 Department of Endocrine Surgery, University College London Hospitals NHS Foundation Trust, London, UK.
4 Department of Surgery, Great Ormond Street Hospital for Children NHS Foundation Trust, London, UK.
5 Department of Oncology, University College London Hospitals NHS Foundation Trust, London, UK.
6 Department of Oncology, Great Ormond Street Hospital for Children NHS Foundation Trust, Great Ormond Street, London, UK.