1. Department of Medicine, Faculty of Medicine, Imperial College London, London, UK
2. Department of Endocrine Surgery, John Radcliffe Hospital, Oxford, UK
3. Department of Endocrinology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
4. Centre for Endocrinology, Diabetes and Metabolism, University of Birmingham, Birmingham Health Partners, Birmingham, UK
5. Department of Endocrinology, Queen Elizabeth Hospital Birmingham, University Hospitals Birmingham NHS Foundation Trust, 3rd Floor Heritage Building, Birmingham, B15 2TT, UK